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How can I transition height: 0; to height: auto; using CSS?

I am trying to make a <ul> slide down using CSS transitions.

The <ul> starts off at height: 0;. On hover, the height is set to height:auto;. However, this is causing it to simply appear, not transition,

If I do it from height: 40px; to height: auto;, then it will slide up to height: 0;, and then suddenly jump to the correct height.

How else could I do this without using JavaScript?

#child0 { height: 0; overflow: hidden; background-color: #dedede; -moz-transition: height 1s ease; -webkit-transition: height 1s ease; -o-transition: height 1s ease; transition: height 1s ease; } #parent0:hover #child0 { height: auto; } #child40 { height: 40px; overflow: hidden; background-color: #dedede; -moz-transition: height 1s ease; -webkit-transition: height 1s ease; -o-transition: height 1s ease; transition: height 1s ease; } #parent40:hover #child40 { height: auto; } h1 { font-weight: bold; } The only difference between the two snippets of CSS is one has height: 0, the other height: 40.


Hover me (height: 0)

Some content
Some content
Some content
Some content
Some content
Some content

Hover me (height: 40)

Some content
Some content
Some content
Some content
Some content
Some content

I believe the height:auto/max-height solution will only work if you're expanding area is greater than the height you want to restrict. If you have a max-height of 300px, but a combo box dropdown, which can return 50px, then max-height won't help you, 50px is variable depending on the number of elements, you can arrive to an impossible situation where I can't fix it because the height is not fixed, height:auto was the solution, but I can't use transitions with this.
OP is trying for css solution, not js, otherwise they could just use overflow and animate
@VIDesignz: But inner div's -100% margin-top receives the width of the wrapper div, not the height. So this solution has the same kind of problem, that the max-height solution. Moreover when the width is smaller than the height of the content, not all content is hidden by -100% margin-top. So this is a wrong solution.
See github.com/w3c/csswg-drafts/issues/626 for discussion around the spec and implementation of a proper solution
@Paulie_D The question is about height, not width. All the answers are about height. Please don't change the question title to be about something it's not.

j
jlouzado

Use max-height in the transition and not height. And set a value on max-height to something bigger than your box will ever get.

See JSFiddle demo provided by Chris Jordan in another answer here.

#menu #list { max-height: 0; transition: max-height 0.15s ease-out; overflow: hidden; background: #d5d5d5; } #menu:hover #list { max-height: 500px; transition: max-height 0.25s ease-in; }


this works great! except there is a delay when it starts, because it starts for max-height which initially is very high..hmm, i think this is somewhat annoying
+1 Great solution! The speed of the transition is calculated is calculated as the time you specify to transition to the max-height value... but since height will be less than max-height, the transition to actual height will occur faster (often significantly) than the time specified.
Note that this may cause ugly transition ending when you have to use values that are much bigger than the actual computed value. I noticed this while trying to make a div grow from 0 height to the content height that varies greatly due to different screen sizes(2 lines on my 2560x1440 monitor vs >10 lines on a smartphone). For this I ended up going with js.
Very ugly solution since it creates a delay in one direction but not the other.
This is a pretty lazy solution. I'm assuming OP wants to use height : auto because the expanded height of the container is somewhat unpredictable. This solution will cause a delay before the animation becomes visible. Additionally the visible duration of the animation will be unpredictable. You'll get much more predictable (and likely smoother) results by calculating the combined height of each of the containers child nodes and then easing to an exact height value.
d
dotnetCarpenter

You should use scaleY instead.

ul { background-color: #eee; transform: scaleY(0); transform-origin: top; transition: transform 0.26s ease; } p:hover ~ ul { transform: scaleY(1); }

Hover This

  • Coffee
  • Tea
  • Milk

I've made a vendor prefixed version of the above code on jsfiddle, and changed your jsfiddle to use scaleY instead of height.

Edit Some people do not like how scaleY transforms the content. If that is a problem then I suggest using clip instead.

ul { clip: rect(auto, auto, 0, auto); position: absolute; margin: -1rem 0; padding: .5rem; color: white; background-color: rgba(0, 0, 0, 0.8); transition-property: clip; transition-duration: 0.5s; transition-timing-function: cubic-bezier(0.175, 0.885, 0.32, 1.275); } h3:hover ~ ul, h3:active ~ ul, ul:hover { clip: rect(auto, auto, 10rem, auto); }

Hover here

  • This list
  • is clipped.
  • A clip transition
  • will show it

Some text...


This method only partially achieves the desired effect but doesn't actually remove the space. The transformed box acts like a relatively positioned element - the space is taken up no matter how it is scaled. Check out this jsFiddle which takes your first one and just adds some bogus text at the bottom. Note how the text below it doesn't move up when the box height is scaled to zero.
Now it does: jsfiddle.net/gNDX3/1 Basically you need to style your elements according to what you need. There is no silver bullet or widget like behavior in CSS/HTML.
While I applaud someone trying different approaches, the real-world effect and complications this solution brings is far worse than the already awful max-height hack. Please do not use.
"Now it does" except that the content below the disappearing element jumps up before the element slides away. Could be useful sometimes, however the point of transitions is to smoothly change visuals, not trade one stark jump for another.
In effect, using a clip transform is no different than simply setting the max-height value. It still suffers from non-fixed amount of appearent animation delay with highly dynamic content size.
a
animuson

You can't currently animate on height when one of the heights involved is auto, you have to set two explicit heights.


S
Samuel Liew

The solution that I've always used was to first fade out, then shrink the font-size, padding and margin values. It doesn't look the same as a wipe, but it works without a static height or max-height.

Working example:

/* final display */ #menu #list { margin: .5em 1em; padding: 1em; } /* hide */ #menu:not(:hover) #list { font-size: 0; margin: 0; opacity: 0; padding: 0; /* fade out, then shrink */ transition: opacity .25s, font-size .5s .25s, margin .5s .25s, padding .5s .25s; } /* reveal */ #menu:hover #list { /* unshrink, then fade in */ transition: font-size .25s, margin .25s, padding .25s, opacity .5s .25s; }

Another paragraph...


If you have buttons or any other non-text elements you will end up with unwanted whitespace while not hovering.
You can further refine it by selecting all child elements with * and applying other changes. Buttons should've been affected by my above code, however, if they were correctly styled with em.
Don't do this. This is not GPU accelerated and will result in very janky animations (as demonstrated by the snippet in this answer).
T
TylerH

This is a CSS-only solution with the following properties:

There is no delay at the beginning, and the transition doesn't stop early. In both directions (expanding and collapsing), if you specify a transition duration of 300ms in your CSS, then the transition takes 300ms, period.

It's transitioning the actual height (unlike transform: scaleY(0)), so it does the right thing if there's content after the collapsible element.

While (like in other solutions) there are magic numbers (like "pick a length that is higher than your box is ever going to be"), it's not fatal if your assumption ends up being wrong. The transition may not look amazing in that case, but before and after the transition, this is not a problem: In the expanded (height: auto) state, the whole content always has the correct height (unlike e.g. if you pick a max-height that turns out to be too low). And in the collapsed state, the height is zero as it should.

Demo

Here's a demo with three collapsible elements, all of different heights, that all use the same CSS. You might want to click "full page" after clicking "run snippet". Note that the JavaScript only toggles the collapsed CSS class, there's no measuring involved. (You could do this exact demo without any JavaScript at all by using a checkbox or :target). Also note that the part of the CSS that's responsible for the transition is pretty short, and the HTML only requires a single additional wrapper element.

$(function () { $(".toggler").click(function () { $(this).next().toggleClass("collapsed"); $(this).toggleClass("toggled"); // this just rotates the expander arrow }); }); .collapsible-wrapper { display: flex; overflow: hidden; } .collapsible-wrapper:after { content: ''; height: 50px; transition: height 0.3s linear, max-height 0s 0.3s linear; max-height: 0px; } .collapsible { transition: margin-bottom 0.3s cubic-bezier(0, 0, 0, 1); margin-bottom: 0; max-height: 1000000px; } .collapsible-wrapper.collapsed > .collapsible { margin-bottom: -2000px; transition: margin-bottom 0.3s cubic-bezier(1, 0, 1, 1), visibility 0s 0.3s, max-height 0s 0.3s; visibility: hidden; max-height: 0; } .collapsible-wrapper.collapsed:after { height: 0; transition: height 0.3s linear; max-height: 50px; } /* END of the collapsible implementation; the stuff below is just styling for this demo */ #container { display: flex; align-items: flex-start; max-width: 1000px; margin: 0 auto; } .menu { border: 1px solid #ccc; box-shadow: 0 1px 3px rgba(0,0,0,0.5); margin: 20px; } .menu-item { display: block; background: linear-gradient(to bottom, #fff 0%,#eee 100%); margin: 0; padding: 1em; line-height: 1.3; } .collapsible .menu-item { border-left: 2px solid #888; border-right: 2px solid #888; background: linear-gradient(to bottom, #eee 0%,#ddd 100%); } .menu-item.toggler { background: linear-gradient(to bottom, #aaa 0%,#888 100%); color: white; cursor: pointer; } .menu-item.toggler:before { content: ''; display: block; border-left: 8px solid white; border-top: 8px solid transparent; border-bottom: 8px solid transparent; width: 0; height: 0; float: right; transition: transform 0.3s ease-out; } .menu-item.toggler.toggled:before { transform: rotate(90deg); } body { font-family: sans-serif; font-size: 14px; } *, *:after { box-sizing: border-box; }

How does it work?

There are in fact two transitions involved in making this happen. One of them transitions the margin-bottom from 0px (in the expanded state) to -2000px in the collapsed state (similar to this answer). The 2000 here is the first magic number, it's based on the assumption that your box won't be higher than this (2000 pixels seems like a reasonable choice).

Using the margin-bottom transition alone by itself has two issues:

If you actually have a box that's higher than 2000 pixels, then a margin-bottom: -2000px won't hide everything -- there'll be visible stuff even in the collapsed case. This is a minor fix that we'll do later.

If the actual box is, say, 1000 pixels high, and your transition is 300ms long, then the visible transition is already over after about 150ms (or, in the opposite direction, starts 150ms late).

Fixing this second issue is where the second transition comes in, and this transition conceptually targets the wrapper's minimum height ("conceptually" because we're not actually using the min-height property for this; more on that later).

Here's an animation that shows how combining the bottom margin transition with the minimum height transition, both of equal duration, gives us a combined transition from full height to zero height that has the same duration.

https://i.stack.imgur.com/TwbsG.gif

The left bar shows how the negative bottom margin pushes the bottom upwards, reducing the visible height. The middle bar shows how the minimum height ensures that in the collapsing case, the transition doesn't end early, and in the expanding case, the transition doesn't start late. The right bar shows how the combination of the two causes the box to transition from full height to zero height in the correct amount of time.

For my demo I've settled on 50px as the upper minimum height value. This is the second magic number, and it should be lower than the box' height would ever be. 50px seems reasonable as well; it seems unlikely that you'd very often want to make an element collapsible that isn't even 50 pixels high in the first place.

As you can see in the animation, the resulting transition is continuous, but it is not differentiable -- at the moment when the minimum height is equal to the full height adjusted by the bottom margin, there is a sudden change in speed. This is very noticeable in the animation because it uses a linear timing function for both transitions, and because the whole transition is very slow. In the actual case (my demo at the top), the transition only takes 300ms, and the bottom margin transition is not linear. I've played around with a lot of different timing functions for both transitions, and the ones I ended up with felt like they worked best for the widest variety of cases.

Two problems remain to fix:

the point from above, where boxes of more than 2000 pixels height aren't completely hidden in the collapsed state, and the reverse problem, where in the non-hidden case, boxes of less than 50 pixels height are too high even when the transition isn't running, because the minimum height keeps them at 50 pixels.

We solve the first problem by giving the container element a max-height: 0 in the collapsed case, with a 0s 0.3s transition. This means that it's not really a transition, but the max-height is applied with a delay; it only applies once the transition is over. For this to work correctly, we also need to pick a numerical max-height for the opposite, non-collapsed, state. But unlike in the 2000px case, where picking too large of a number affects the quality of the transition, in this case, it really doesn't matter. So we can just pick a number that is so high that we know that no height will ever come close to this. I picked a million pixels. If you feel you may need to support content of a height of more than a million pixels, then 1) I'm sorry, and 2) just add a couple of zeros.

The second problem is the reason why we're not actually using min-height for the minimum height transition. Instead, there is an ::after pseudo-element in the container with a height that transitions from 50px to zero. This has the same effect as a min-height: It won't let the container shrink below whatever height the pseudo-element currently has. But because we're using height, not min-height, we can now use max-height (once again applied with a delay) to set the pseudo-element's actual height to zero once the transition is over, ensuring that at least outside the transition, even small elements have the correct height. Because min-height is stronger than max-height, this wouldn't work if we used the container's min-height instead of the pseudo-element's height. Just like the max-height in the previous paragraph, this max-height also needs a value for the opposite end of the transition. But in this case we can just pick the 50px.

Tested in Chrome (Win, Mac, Android, iOS), Firefox (Win, Mac, Android), Edge, IE11 (except for a flexbox layout issue with my demo that I didn't bother debugging), and Safari (Mac, iOS). Speaking of flexbox, it should be possible to make this work without using any flexbox; in fact I think you could make almost everything work in IE7 – except for the fact that you won't have CSS transitions, making it a rather pointless exercise.


I wish you could shorten (simplify) your solution, or the code example at least - it looks like 90% of the code example isn't relevant to your answer.
For someone on a learning mission it is a good answer, for several reasons. First, it has complete "real life" code exxample. Someone could take that code, experiment with it, and learn more. And the detail in the explination...perfectly detailed. thank you, @balpha , for taking the time for this answer :)
Incredible ! This actually works perfectly, and with some modifications it also fits my use case of a collapsed element not being at 0 height (in my case a grid only showing one row when collapsed, and showing all rows when opened). Not only that but it seems easy to implement in a variety of contexts, can be "plugged in" existing pages without having to change too much of the parent and child elements, which a lot of other solutions can't do.
Appreciate all the thoroughness, but, being a bit of a stickler here, the animation looks and feels bad. Not a smooth timing function at the end of the day. Is that inherent to this approach?
@StevenLu To an extent, yes. I address this question in my answer, see the sentence starting with "This is very noticeable in the animation ..."
S
Spencer O'Reilly

You can, with a little bit of non-semantic jiggery-pokery. My usual approach is to animate the height of an outer DIV which has a single child which is a style-less DIV used only for measuring the content height.

function growDiv() { var growDiv = document.getElementById('grow'); if (growDiv.clientHeight) { growDiv.style.height = 0; } else { var wrapper = document.querySelector('.measuringWrapper'); growDiv.style.height = wrapper.clientHeight + "px"; } } #grow { -moz-transition: height .5s; -ms-transition: height .5s; -o-transition: height .5s; -webkit-transition: height .5s; transition: height .5s; height: 0; overflow: hidden; outline: 1px solid red; }

The contents of my div.
The contents of my div.
The contents of my div.
The contents of my div.
The contents of my div.
The contents of my div.

One would like to just be able to dispense with the .measuringWrapper and just set the DIV's height to auto and have that animate, but that doesn't seem to work (the height gets set, but no animation occurs).

function growDiv() { var growDiv = document.getElementById('grow'); if (growDiv.clientHeight) { growDiv.style.height = 0; } else { growDiv.style.height = 'auto'; } } #grow { -moz-transition: height .5s; -ms-transition: height .5s; -o-transition: height .5s; -webkit-transition: height .5s; transition: height .5s; height: 0; overflow: hidden; outline: 1px solid red; }

The contents of my div.
The contents of my div.
The contents of my div.
The contents of my div.
The contents of my div.
The contents of my div.

My interpretation is that an explicit height is needed for the animation to run. You can't get an animation on height when either height (the start or end height) is auto.


Since this relies on javascript, you could also easily add the measuringWrapper using javascript too!
You can do it without wrapper. Just: function growDiv() { var growDiv = document.getElementById('grow'); if (growDiv.clientHeight) { growDiv.style.height = 0; } else { growDiv.style.height = growDiv.scrollHeight+'px'; } }
I prefer this method because it is precise. I also like to adjust the folding element's transition speed based on the computed height. That way tall elements take proportionately longer to unfold than short ones. i.e. folder.style.transition = `height ${maxHeight}ms`;
J
Joran Den Houting

A visual workaround to animating height using CSS3 transitions is to animate the padding instead.

You don't quite get the full wipe effect, but playing around with the transition-duration and padding values should get you close enough. If you don't want to explicitly set height/max-height, this should be what you're looking for.

div {
    height: 0;
    overflow: hidden;
    padding: 0 18px;
    -webkit-transition: all .5s ease;
       -moz-transition: all .5s ease;
            transition: all .5s ease;
}
div.animated {
    height: auto;
    padding: 24px 18px;
}

http://jsfiddle.net/catharsis/n5XfG/17/ (riffed off stephband's above jsFiddle)


Except that here you aren't animating the height at all. You are animating the padding... it can disappear just fine because it can animate from the current state down to 0, but if you watch closely when it expands it pops open with the text and then the padding only animates.. because it doesn't know how to animate from 0 to auto.... it needs a numerical range... that's how tweening works.
I'm not sure how to put this in a way that isn't rude, but... it looks unprofessional. At least stackoverflow.com/a/30531678/340947 makes the motion "continuous" ... but it isn't smooth
O
Oleg Vaskevich

The accepted answer works for most cases, but it doesn't work well when your div can vary greatly in height — the animation speed is not dependent on the actual height of the content, and it can look choppy.

You can still perform the actual animation with CSS, but you need to use JavaScript to compute the height of the items, instead of trying to use auto. No jQuery is required, although you may have to modify this a bit if you want compatibility (works in the latest version of Chrome :)).

window.toggleExpand = function(element) { if (!element.style.height || element.style.height == '0px') { element.style.height = Array.prototype.reduce.call(element.childNodes, function(p, c) {return p + (c.offsetHeight || 0);}, 0) + 'px'; } else { element.style.height = '0px'; } } #menu #list { height: 0px; transition: height 0.3s ease; background: #d5d5d5; overflow: hidden; }


@Coderer you could use clientHeight
This has a very nice result. But the JavaScript looks like machine code for the most part. How could you re-write the code as though you are speaking English (readable code)?
also you can use scrollHeight when the height is 0.
a
amn

There was little mention of the Element.prototype.scrollHeight property which can be useful here and still may be used with a pure CSS transition, although scripting support would obviously be required. The property always contains the "full" height of an element, regardless of whether and how its content overflows as a result of collapsed height (e.g. height: 0).

As such, for a height: 0 (effectively fully collapsed) element, its "normal" or "full" height is still readily available through its scrollHeight value (invariably a pixel length).

For such an element, assuming it already has the transition set up like (using ul as per original question):

ul {
    height: 0;
    transition: height 1s; /* An example transition. */
}

We can trigger desired animated "expansion" of height, using CSS only, with something like the following (here assuming ul variable refers to the list):

ul.style.height = ul.scrollHeight + "px";

That's it. If you need to collapse the list, either of the two following statements will do:

ul.style.height = 0;
ul.style.removeProperty("height");

My particular use case revolved around animating lists of unknown and often considerable lengths, so I was not comfortable dealing with "large enough" height or max-height specification and risking cut-off content or content that you suddenly need to scroll (if overflow: auto, for example). Additionally, the easing and timing is broken with max-height-based solutions, because the used height may reach its maximum value a lot sooner than it would take for max-height to reach 9999px. And as screen resolutions grow, pixel lengths like 9999px leave a bad taste in my mouth. This particular solution solves the problem in an elegant manner, in my opinion.

Finally, here is hoping that future revisions of CSS address authors' need to do these kind of things even more elegantly -- revisit the notion of "computed" vs "used" and "resolved" values, and consider whether transitions should apply to computed values, including transitions with width and height (which currently get a bit of a special treatment).


You didn't find it in the other answers here because interacting with the DOM using the Element.scrollHeight property requires JavaScript and, as the question clearly states, they want to do this without JavaScript.
a
amn

My workaround is to transition max-height to the exact content height for a nice smooth animation, then use a transitionEnd callback to set max-height to 9999px so the content can resize freely.

var content = $('#content'); content.inner = $('#content .inner'); // inner div needed to get size of content when closed // css transition callback content.on('transitionEnd webkitTransitionEnd transitionend oTransitionEnd msTransitionEnd', function(e){ if(content.hasClass('open')){ content.css('max-height', 9999); // try setting this to 'none'... I dare you! } }); $('#toggle').on('click', function(e){ content.toggleClass('open closed'); content.contentHeight = content.outerHeight(); if(content.hasClass('closed')){ // disable transitions & set max-height to content height content.removeClass('transitions').css('max-height', content.contentHeight); setTimeout(function(){ // enable & start transition content.addClass('transitions').css({ 'max-height': 0, 'opacity': 0 }); }, 10); // 10ms timeout is the secret ingredient for disabling/enabling transitions // chrome only needs 1ms but FF needs ~10ms or it chokes on the first animation for some reason }else if(content.hasClass('open')){ content.contentHeight += content.inner.outerHeight(); // if closed, add inner height to content height content.css({ 'max-height': content.contentHeight, 'opacity': 1 }); } }); .transitions { transition: all 0.5s ease-in-out; -webkit-transition: all 0.5s ease-in-out; -moz-transition: all 0.5s ease-in-out; } body { font-family:Arial; line-height: 3ex; } code { display: inline-block; background: #fafafa; padding: 0 1ex; } #toggle { display:block; padding:10px; margin:10px auto; text-align:center; width:30ex; } #content { overflow:hidden; margin:10px; border:1px solid #666; background:#efefef; opacity:1; } #content .inner { padding:10px; overflow:auto; }

Smooth CSS Transitions Between height: 0 and height: auto

A clever workaround is to use max-height instead of height, and set it to something bigger than your content. Problem is the browser uses this value to calculate transition duration. So if you set it to max-height: 1000px but the content is only 100px high, the animation will be 10x too fast.

Another option is to measure the content height with JS and transition to that fixed value, but then you have to keep track of the content and manually resize it if it changes.

This solution is a hybrid of the two - transition to the measured content height, then set it to max-height: 9999px after the transition for fluid content sizing.



m
malihu

Use max-height with different transition easing and delay for each state.

HTML:

<a href="#" id="trigger">Hover</a>
<ul id="toggled">
    <li>One</li>
    <li>Two</li>
    <li>Three</li>
<ul>

CSS:

#toggled{
    max-height: 0px;
    transition: max-height .8s cubic-bezier(0, 1, 0, 1) -.1s;
}

#trigger:hover + #toggled{
    max-height: 9999px;
    transition-timing-function: cubic-bezier(0.5, 0, 1, 0); 
    transition-delay: 0s;
}

See example: http://jsfiddle.net/0hnjehjc/1/


The problem here is, to ensure you have enough space in a dynamic environment, you need to use ridiculous max-heights like 999999px. This, on the other hand, will shift your animation, because the frames are calculated from this value. So you might end up with animation "delay" in one direction and a really fast end in the other direction (corr: timing-functions)
V
V Maharajh

No hard coded values.

No JavaScript.

No approximations.

The trick is to use a hidden & duplicated div to get the browser to understand what 100% means.

This method is suitable whenever you're able to duplicate the DOM of the element you wish to animate.

.outer { border: dashed red 1px; position: relative; } .dummy { visibility: hidden; } .real { position: absolute; background: yellow; height: 0; transition: height 0.5s; overflow: hidden; } .outer:hover>.real { height: 100%; } Hover over the box below:

unpredictable content unpredictable content unpredictable content unpredictable content unpredictable content unpredictable content unpredictable content unpredictable content unpredictable content unpredictable content unpredictable content unpredictable content unpredictable content unpredictable content unpredictable content


C
Community

As I post this there are over 30 answers already, but I feel my answer improves on the already accepted answer by jake.

I was not content with the issue that arises from simply using max-height and CSS3 transitions, since as many commenters noted, you have to set your max-height value very close to the actual height or you'll get a delay. See this JSFiddle for an example of that problem.

To get around this (while still using no JavaScript), I added another HTML element that transitions the transform: translateY CSS value.

This means both max-height and translateY are used: max-height allows the element to push down elements below it, while translateY gives the "instant" effect we want. The issue with max-height still exists, but its effect is lessened. This means you can set a much larger height for your max-height value and worry about it less.

The overall benefit is that on the transition back in (the collapse), the user sees the translateY animation immediately, so it doesn't really matter how long the max-height takes.

Solution as Fiddle

body { font-family: sans-serif; } .toggle { position: relative; border: 2px solid #333; border-radius: 3px; margin: 5px; width: 200px; } .toggle-header { margin: 0; padding: 10px; background-color: #333; color: white; text-align: center; cursor: pointer; } .toggle-height { background-color: tomato; overflow: hidden; transition: max-height .6s ease; max-height: 0; } .toggle:hover .toggle-height { max-height: 1000px; } .toggle-transform { padding: 5px; color: white; transition: transform .4s ease; transform: translateY(-100%); } .toggle:hover .toggle-transform { transform: translateY(0); }

Toggle!

Content!

Content!

Content!

Content!

Toggle!

Content!

Content!

Content!

Content!


"doesn't really matter" is still pretty subjective. The instant feedback from the transform's transition is certainly good, but this definitely leaves something to be desired still
M
Mori

According to MDN Web Docs, auto values have been intentionally excluded from the CSS transitions spec, so instead of height: auto, use height: 100%, top, or the flex property in grid and flex layouts.

Expanding/collapsing an overlay

.grid-container { display: grid; position: absolute; } .content { background: aqua; height: 0; overflow: hidden; transition: 1s; } span:hover + .grid-container .content { height: 100%; } Hover over me!

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Rest of the page content...

Expanding/collapsing a sliding overlay

.grid-container { display: grid; position: absolute; overflow: hidden; pointer-events: none; /* to enable interaction with elements below the container */ } .content { background: aqua; pointer-events: auto; position: relative; top: -100%; transition: 1s; } span:hover + .grid-container .content { top: 0; } Hover over me!

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Rest of the page content...

Expanding/collapsing in the document flow

html { display: grid; } body { display: flex; flex-direction: column; } .content { background: aqua; flex-basis: 0; overflow: hidden; transition: 1s; } span:hover + .content { flex: 1; } Hover over me!

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Rest of the page content...


I was excited about the example: Expanding/collapsing in the document flow but it doesn't work as the container has a defined height so the rest of the content will be affected, the content outside the container,
Yea! Thanks for shared, If I think so, in some situations where it does not matter if you overspacing at the end of the content, in the case that the content is a full page, you will always have untold spacing at the end
@MarcoMesen: Just edited my example.
Hey @Mori Thanks! that works great, we are basically animating the expansion of the Grid but the secret is the internal Flex, thank you very much!
@Mori in this case it works, but it's often not easy to change the markup of the entire page, to use the body as the flex container and place the expanding/collapsing element right under it, just for this effect. Also, how would you solve two expanding elements next to each other and each element pushes down the same content beneath it?
V
VIDesignz

Ok, so I think I came up with a super simple answer... no max-height, uses relative positioning, works on li elements, & is pure CSS. I have not tested in anything but Firefox, though judging by the CSS, it should work on all browsers.

FIDDLE: http://jsfiddle.net/n5XfG/2596/

CSS

.wrap { overflow:hidden; }

.inner {
            margin-top:-100%;
    -webkit-transition:margin-top 500ms;
            transition:margin-top 500ms;
}

.inner.open { margin-top:0px; }

HTML

<div class="wrap">
    <div class="inner">Some Cool Content</div>
</div>

This will work until the height of the element exceeds its width. It's the basis of how margins are calculated using percentages: they are calculated based off the width of the element. So if you have a 1000 px wide element, then an element at 1100 px will be too large for this solution to work, meaning you'd have to increase that negative top margin. Basically, it's the exact same problem as using height or max-height.
S
Sijav

EDIT: Scroll down for updated answer
I was making a drop down list and saw this Post ... many different answers but I decide to share my drop down list too, ... It's not perfect but at least it will using only css for drop down! I've been using transform:translateY(y) to transform the list to the view ...
You can see more in the test
http://jsfiddle.net/BVEpc/4/
I've placed div behind every li because my drop down list are coming from up and to show them properly this was needed, my div code is:

#menu div {
    transition: 0.5s 1s;
    z-index:-1;
    -webkit-transform:translateY(-100%);
    -webkit-transform-origin: top;
}

and hover is :

#menu > li:hover div {
    transition: 0.5s;
    -webkit-transform:translateY(0);
}

and because ul height is set to the content it can get over your body content that's why I did this for ul:

 #menu ul {
    transition: 0s 1.5s;
    visibility:hidden;
    overflow:hidden;
}

and hover:

#menu > li:hover ul {
     transition:none;
     visibility:visible;
}

the second time after transition is delay and it will get hidden after my drop down list has been closed animately ...
Hope later someone get benefit of this one.

EDIT: I just can't believe ppl actually using this prototype! this drop down menu is only for one sub menu and that's all!! I've updated a better one that can have two sub menu for both ltr and rtl direction with IE 8 support.
Fiddle for LTR
Fiddle for RTL
hopefully someone find this useful in future.


J
Joran Den Houting

You can transition from height:0 to height:auto providing that you also provide min-height and max-height.

div.stretchy{
    transition: 1s linear;
}

div.stretchy.hidden{
    height: 0;
}

div.stretchy.visible{
    height: auto;
    min-height:40px;
    max-height:400px;
}

This will not transition height, just max-height. height will instantly jump from 0 to auto, while max-height will transition which seems to work, but creates the same problem as other answers try to address.
This is actually great idea and works when I can estimate max-height, and don't care about exact length of animation.
L
Lee Comstock

Flexbox Solution

Pros:

simple

no JS

smooth transition

Cons:

element needs to be put in a fixed height flex container

The way it works is by always having flex-basis: auto on the element with content, and transitioning flex-grow and flex-shrink instead.

Edit: Improved JS Fiddle inspired by the Xbox One interface.

* { margin: 0; padding: 0; box-sizing: border-box; transition: 0.25s; font-family: monospace; } body { margin: 10px 0 0 10px; } .box { width: 150px; height: 150px; margin: 0 2px 10px 0; background: #2d333b; border: solid 10px #20262e; overflow: hidden; display: inline-flex; flex-direction: column; } .space { flex-basis: 100%; flex-grow: 1; flex-shrink: 0; } p { flex-basis: auto; flex-grow: 0; flex-shrink: 1; background: #20262e; padding: 10px; width: 100%; text-align: left; color: white; } .box:hover .space { flex-grow: 0; flex-shrink: 1; } .box:hover p { flex-grow: 1; flex-shrink: 0; }

Super Metroid Prime Fusion

Resident Evil 2 Remake

Yolo The Game

Final Fantasy 7 Remake + All Additional DLC + Golden Tophat

DerpVille

JS Fiddle


I like this solution. Together with absolute positioning, nested lists and pointer-events I managed to get quite a nice menu. I didn't find to many negatives. Anybody?
The CSS in my JSFiddle broke for some reason, but yeah I like this solution thanks!
d
dallaslu

One sentence solution: Use padding transition. It's enough for most of cases such as accordion, and even better because it's fast due to that the padding value is often not big.

If you want the animation process to be better, just raise the padding value.

.parent{ border-top: #999 1px solid;} h1{ margin: .5rem; font-size: 1.3rem} .children { height: 0; overflow: hidden; background-color: #dedede; transition: padding .2s ease-in-out, opacity .2s ease-in-out; padding: 0 .5rem; opacity: 0; } .children::before, .children::after{ content: "";display: block;} .children::before{ margin-top: -2rem;} .children::after{ margin-bottom: -2rem;} .parent:hover .children { height: auto; opacity: 1; padding: 2.5rem .5rem;/* 0.5 + abs(-2), make sure it's less than expected min-height */ }

Hover me

Some content
Some content
Some content
Some content
Some content
Some content

Hover me(long content)

Some content
Some content
Some content
Some content
Some content
Some content
Some content
Some content
Some content
Some content
Some content

Hover me(short content)

Some content
Some content
Some content


J
Joran Den Houting

Expanding on @jake's answer, the transition will go all the way to the max height value, causing an extremely fast animation - if you set the transitions for both :hover and off you can then control the crazy speed a little bit more.

So the li:hover is when the mouse enters the state and then the transition on the non-hovered property will be the mouse leave.

Hopefully this will be of some help.

e.g:

.sidemenu li ul {
   max-height: 0px;
   -webkit-transition: all .3s ease;
   -moz-transition: all .3s ease;
   -o-transition: all .3s ease;
   -ms-transition: all .3s ease;
   transition: all .3s ease;
}
.sidemenu li:hover ul {
    max-height: 500px;
    -webkit-transition: all 1s ease;
   -moz-transition: all 1s ease;
   -o-transition: all 1s ease;
   -ms-transition: all 1s ease;
   transition: all 1s ease;
}
/* Adjust speeds to the possible height of the list */

Here's a fiddle: http://jsfiddle.net/BukwJ/


T
TylerH

This solution uses a few techniques:

padding-bottom:100% 'hack' where percentages are defined in terms of the current width of the element. More info on this technique.

float shrink-wrapping, (necessitating an extra div to apply the float clearing hack)

non-semantic use of https://caniuse.com/#feat=css-writing-mode and some transformations to undo it (this allows use of the padding hack above in a vertical context)

The upshot though is that we get performant transitioning using CSS only, and a single transition function to smoothly achieve the transition; the holy grail!

Of course, there's a downside! I can't work out how to control the width at which content gets cut off (overflow:hidden); because of the padding-bottom hack, the width and height are intimately related. There may be a way though, so will come back to it.

https://jsfiddle.net/EoghanM/n1rp3zb4/28/

body { padding: 1em; } .trigger { font-weight: bold; } /* .expander is there for float clearing purposes only */ .expander::after { content: ''; display: table; clear: both; } .outer { float: left; /* purpose: shrink to fit content */ border: 1px solid green; overflow: hidden; } .inner { transition: padding-bottom 0.3s ease-in-out; /* or whatever crazy transition function you can come up with! */ padding-bottom: 0%; /* percentage padding is defined in terms of width. The width at this level is equal to the height of the content */ height: 0; /* unfortunately, change of writing mode has other bad effects like orientation of cursor */ writing-mode: vertical-rl; cursor: default; /* don't want the vertical-text (sideways I-beam) */ transform: rotate(-90deg) translateX(-100%); /* undo writing mode */ transform-origin: 0 0; margin: 0; /* left/right margins here will add to height */ } .inner > div { white-space: nowrap; } .expander:hover .inner, /* to keep open when expanded */ .trigger:hover+.expander .inner { padding-bottom: 100%; }

HoverMe
First Item
Content
Content
Content
Long Content can't be wider than outer height unfortunately
Last Item
after content


As your source said "responsive square" it works only if you have a square content. So it's even not close to the accepted answer ...
T
TylerH

You could do this by creating a reverse (collapse) animation with clip-path.

#child0 { display: none; } #parent0:hover #child0 { display: block; animation: height-animation; animation-duration: 200ms; animation-timing-function: linear; animation-fill-mode: backwards; animation-iteration-count: 1; animation-delay: 200ms; } @keyframes height-animation { 0% { clip-path: polygon(0% 0%, 100% 0.00%, 100% 0%, 0% 0%); } 100% { clip-path: polygon(0% 0%, 100% 0.00%, 100% 100%, 0% 100%); } }

Hover me (height: 0)

Some content
Some content
Some content
Some content
Some content
Some content


Great, but how to make the reveal undone with animation?
J
Jonatas Walker

I've recently been transitioning the max-height on the li elements rather than the wrapping ul.

The reasoning is that the delay for small max-heights is far less noticeable (if at all) compared to large max-heights, and I can also set my max-height value relative to the font-size of the li rather than some arbitrary huge number by using ems or rems.

If my font size is 1rem, I'll set my max-height to something like 3rem (to accommodate wrapped text). You can see an example here:

http://codepen.io/mindfullsilence/pen/DtzjE


s
shunryu111

I understand the question asks for a solution without JavaScript. But for those interested here's my solution using just a little bit of JS.

ok, so the element's css whose height will change by default is set to height: 0; and when open height: auto;. It also has transition: height .25s ease-out;. But of course the problem is that it won't transition to or from height: auto;

So what i've done is when opening or closing set the height to the scrollHeight property of the element. This new inline style will have higher specificity and override both height: auto; and height: 0; and the transition runs.

When opening i add a transitionend event listener which will run just once then remove the inline style setting it back to height: auto; which will allow the element to resize if necessary, as in this more complex example with sub menus https://codepen.io/ninjabonsai/pen/GzYyVe

When closing i remove the inline style right after the next event loop cycle by using setTimeout with no delay. This means height: auto; is temporarily overridden which allows the transition back to height 0;

const showHideElement = (element, open) => { element.style.height = element.scrollHeight + 'px'; element.classList.toggle('open', open); if (open) { element.addEventListener('transitionend', () => { element.style.removeProperty('height'); }, { once: true }); } else { window.setTimeout(() => { element.style.removeProperty('height'); }); } } const menu = document.body.querySelector('#menu'); const list = document.body.querySelector('#menu > ul') menu.addEventListener('mouseenter', () => showHideElement(list, true)); menu.addEventListener('mouseleave', () => showHideElement(list, false)); #menu > ul { height: 0; overflow: hidden; background-color: #999; transition: height .25s ease-out; } #menu > ul.open { height: auto; }


c
csuwldcat

Here's a way to transition from any starting height, including 0, to auto (full size and flexible) without requiring hard-set code on a per-node basis or any user-code to initialize: https://github.com/csuwildcat/transition-auto. This is basically the holy grail for what you want, I believe --> http://codepen.io/csuwldcat/pen/kwsdF. Just slap the following JS file into your page, and all you need to do after that is add/remove a single boolean attribute - reveal="" - from the nodes you want to expand and contract.

Here's all you need to do as the user, once you include the code block found below the example code:

/*** Nothing out of the ordinary in your styles ***/
<style>
    div {
        height: 0;
        overflow: hidden;
        transition: height 1s;
    }
</style>

/*** Just add and remove one attribute and transition to/from auto! ***/

<div>
    I have tons of content and I am 0px in height you can't see me...
</div>

<div reveal>
     I have tons of content and I am 0px in height you can't see me...
     but now that you added the 'reveal' attribute, 
     I magically transitioned to full height!...
</div>

Here's the code block to include in your page, after that, it's all gravy:

Drop this JS file in your page - it all Just Works™

/* Code for height: auto; transitioning */

(function(doc){

/* feature detection for browsers that report different values for scrollHeight when an element's overflow is hidden vs visible (Firefox, IE) */
var test = doc.documentElement.appendChild(doc.createElement('x-reveal-test'));
    test.innerHTML = '-';
    test.style.cssText = 'display: block !important; height: 0px !important; padding: 0px !important; font-size: 0px !important; border-width: 0px !important; line-height: 1px !important; overflow: hidden !important;';
var scroll = test.scrollHeight || 2;
doc.documentElement.removeChild(test);

var loading = true,
    numReg = /^([0-9]*\.?[0-9]*)(.*)/,
    skipFrame = function(fn){
      requestAnimationFrame(function(){
        requestAnimationFrame(fn);
      });
    },
    /* 2 out of 3 uses of this function are purely to work around Chrome's catastrophically busted implementation of auto value CSS transitioning */
    revealFrame = function(el, state, height){
        el.setAttribute('reveal-transition', 'frame');
        el.style.height = height;
        skipFrame(function(){
            el.setAttribute('reveal-transition', state);
            el.style.height = '';
        });
    },
    transitionend = function(e){
      var node = e.target;
      if (node.hasAttribute('reveal')) {
        if (node.getAttribute('reveal-transition') == 'running') revealFrame(node, 'complete', '');
      } 
      else {
        node.removeAttribute('reveal-transition');
        node.style.height = '';
      }
    },
    animationstart = function(e){
      var node = e.target,
          name = e.animationName;   
      if (name == 'reveal' || name == 'unreveal') {

        if (loading) return revealFrame(node, 'complete', 'auto');

        var style = getComputedStyle(node),
            offset = (Number(style.paddingTop.match(numReg)[1])) +
                     (Number(style.paddingBottom.match(numReg)[1])) +
                     (Number(style.borderTopWidth.match(numReg)[1])) +
                     (Number(style.borderBottomWidth.match(numReg)[1]));

        if (name == 'reveal'){
          node.setAttribute('reveal-transition', 'running');
          node.style.height = node.scrollHeight - (offset / scroll) + 'px';
        }
        else {
            if (node.getAttribute('reveal-transition') == 'running') node.style.height = '';
            else revealFrame(node, 'running', node.scrollHeight - offset + 'px');
        }
      }
    };

doc.addEventListener('animationstart', animationstart, false);
doc.addEventListener('MSAnimationStart', animationstart, false);
doc.addEventListener('webkitAnimationStart', animationstart, false);
doc.addEventListener('transitionend', transitionend, false);
doc.addEventListener('MSTransitionEnd', transitionend, false);
doc.addEventListener('webkitTransitionEnd', transitionend, false);

/*
    Batshit readyState/DOMContentLoaded code to dance around Webkit/Chrome animation auto-run weirdness on initial page load.
    If they fixed their code, you could just check for if(doc.readyState != 'complete') in animationstart's if(loading) check
*/
if (document.readyState == 'complete') {
    skipFrame(function(){
        loading = false;
    });
}
else document.addEventListener('DOMContentLoaded', function(e){
    skipFrame(function(){
        loading = false;
    });
}, false);

/* Styles that allow for 'reveal' attribute triggers */
var styles = doc.createElement('style'),
    t = 'transition: none; ',
    au = 'animation: reveal 0.001s; ',
    ar = 'animation: unreveal 0.001s; ',
    clip = ' { from { opacity: 0; } to { opacity: 1; } }',
    r = 'keyframes reveal' + clip,
    u = 'keyframes unreveal' + clip;

styles.textContent = '[reveal] { -ms-'+ au + '-webkit-'+ au +'-moz-'+ au + au +'}' +
    '[reveal-transition="frame"] { -ms-' + t + '-webkit-' + t + '-moz-' + t + t + 'height: auto; }' +
    '[reveal-transition="complete"] { height: auto; }' +
    '[reveal-transition]:not([reveal]) { -webkit-'+ ar +'-moz-'+ ar + ar +'}' +
    '@-ms-' + r + '@-webkit-' + r + '@-moz-' + r + r +
    '@-ms-' + u +'@-webkit-' + u + '@-moz-' + u + u;

doc.querySelector('head').appendChild(styles);

})(document);

/* Code for DEMO */

    document.addEventListener('click', function(e){
      if (e.target.nodeName == 'BUTTON') {
        var next = e.target.nextElementSibling;
        next.hasAttribute('reveal') ? next.removeAttribute('reveal') : next.setAttribute('reveal', '');
      }
    }, false);

I want to upvote this, but instead of answering the question of how to make it work, you shared a plugin that you wrote to make it work. We, the curious, are left to reverse engineer your plugin, which isn't much fun. I wish you would update your answer to contain more explanation of what your plugin does and why. Change the code to be more explanatory. For example, you have a whole section of code which just writes out static CSS. I'd rather see the CSS, than the code that generates it. You can leave out the boring parts, like repeating for all browser prefixes.
J
JonTroncoso

I think I came up with a really solid solution

OK! I know this problem is as old as the internet but I think I have a solution which I turned into a plugin called mutant-transition. My solution sets the style="" attributes for tracked elements whenever theres a change in the DOM. the end result is that you can use good ole CSS for your transitions and not use hacky fixes or special javascript. The only thing you have to do is set what you want to track on the element in question using data-mutant-attributes="X".

<div data-mutant-attributes="height">                                                                      
        This is an example with mutant-transition                                                                                                          
    </div>

Thats it! This solution uses MutationObserver to follow changes in the DOM. Because of this, you don't really have to set anything up or use javascript to manually animate things. Changes are tracked automatically. However, because it uses MutationObserver, this will only transition in IE11+.

Fiddles!

Demonstrating transitioning from height: auto to height: 100%

Demonstrating transitioning height: auto when adding children


Usually, when somebody asks how to do something "without JavaScript", it means the solution must work on browsers that have JavaScript disabled. It doesn't mean "without writing my own scripts". So to say that your plugin can be used without using JavaScript is misleading at best - considering it's a JavaScript plugin.
I should clarify, When I say you don't have to use any special javascript, I mean that you don't have to write any javascript. just include the JS library and specify which attributes you want to watch in the HTML. You don't have to use fixed height css, or figure anything out. just style and go.
u
user3336882

Jake's answer to animate the max-height is great, but I found the delay caused by setting a large max-height annoying.

One could move the collapsable content into an inner div and calculate the max height by getting the height of the inner div (via JQuery it'd be the outerHeight()).

$('button').bind('click', function(e) { 
  e.preventDefault();
  w = $('#outer');
  if (w.hasClass('collapsed')) {
    w.css({ "max-height": $('#inner').outerHeight() + 'px' });
  } else {
    w.css({ "max-height": "0px" });
  }
  w.toggleClass('collapsed');
});

Here's a jsfiddle link: http://jsfiddle.net/pbatey/duZpT

Here's a jsfiddle with the absolute minimal amount of code required: http://jsfiddle.net/8ncjjxh8/


J
Jonatas Walker

I was able to do this. I have a .child & a .parent div. The child div fits perfectly within the parent's width/height with absolute positioning. I then animate the translate property to push it's Y value down 100%. Its very smooth animation, no glitches or down sides like any other solution here.

Something like this, pseudo code

.parent{ position:relative; overflow:hidden; } 
/** shown state */
.child {
  position:absolute;top:0;:left:0;right:0;bottom:0;
  height: 100%;
  transition: transform @overlay-animation-duration ease-in-out;
  .translate(0, 0);
}

/** Animate to hidden by sliding down: */
.child.slidedown {
  .translate(0, 100%); /** Translate the element "out" the bottom of it's .scene container "mask" so its hidden */
}

You would specify a height on .parent, in px, %, or leave as auto. This div then masks out the .child div when it slides down.


The working example of this will be much appreciated.
A
Ali Klein

Alternate CSS-only solution with line-height, padding, opacity and margin:

body { background-color: linen; } main { background-color: white; } [id^="toggle_"] ~ .content { line-height: 0; opacity: 0; padding: 0 .5rem; transition: .2s ease-out; } [id^="toggle_"] ~ .content > p { margin: 0; transition: .2s ease-out; } [id^="toggle_"]:checked ~ .content { opacity: 1; padding: .5rem; line-height: 1.5; } [id^="toggle_"]:checked ~ .content p { margin-bottom: .75rem; } [id^="toggle_"] + label { display: flex; justify-content: space-between; padding: 0.5em 1em; background: lightsteelblue; border-bottom: 1px solid gray; cursor: pointer; } [id^="toggle_"] + label:before { content: "Show"; } [id^="toggle_"]:checked + label:before { content: "Hide"; } [id^="toggle_"] + label:after { content: "\25BC"; } [id^="toggle_"]:checked + label:after { content: "\25B2"; }

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Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis dolor neque, commodo quis leo ut, auctor tincidunt mauris. Nunc fringilla tincidunt metus, non gravida lorem condimentum non. Duis ornare purus nisl, at porta arcu eleifend eget. Integer lorem ante, porta vulputate dui ut, blandit tempor tellus. Proin facilisis bibendum diam, sit amet rutrum est feugiat ut. Mauris rhoncus convallis arcu in condimentum. Donec volutpat dui eu mollis vulputate. Nunc commodo lobortis nunc at ultrices. Suspendisse in lobortis diam. Suspendisse eget vestibulum ex.

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C
Charley

I realize this thread is getting old, but it ranks high on certain Google searches so I figure it's worth updating.

You also just get/set the element's own height:

var load_height = document.getElementById('target_box').clientHeight;
document.getElementById('target_box').style.height = load_height + 'px';

You should dump this Javascript immediately after target_box's closing tag in an inline script tag.