Specifying Style and Weight for Google Fonts

They use regular CSS.

Just use your regular font family like this:

font-family: 'Open Sans', sans-serif;

Now you decide what "weight" the font should have by adding

for semi-bold

font-weight:600;

for bold (700)

font-weight:bold;

for extra bold (800)

font-weight:800;

Like this its fallback proof, so if the google font should "fail" your backup font Arial/Helvetica(Sans-serif) use the same weight as the google font.

Pretty smart :-)

Note that the different font weights have to be specifically imported via the link tag url (family query param of the google font url) in the header.

For example the following link will include both weights 400 and 700:

<link href='fonts.googleapis.com/css?family=Comfortaa:400,700'; rel='stylesheet' type='text/css'>

For CSS2

<link href='fonts.googleapis.com/css2?family=Comfortaa:wght@400;700'; rel='stylesheet' type='text/css'>

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Here's the issue: You can't specify font weights that don't exist in the font set from Google. Click on the SEE SPECIMEN link below the font, then scroll down to the STYLES section. There you'll see each of the "styles" available for that particular font. Sadly Google doesn't list the CSS font weights for each style. Here's how the names map to CSS font weight numbers:

Thin            100     
Extra Light     200
Light           300
Regular         400
Medium          500
Semi-Bold       600
Bold            700
Extra-Bold      800
Black           900

Note that very few fonts come in all 9 weights.

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font-family:'Open Sans' , sans-serif;

For light: font-weight : 100; Or font-weight : lighter;

For normal: font-weight : 500; Or font-weight : normal;

For bold: font-weight : 700; Or font-weight : bold;

For more bolder: font-weight : 900; Or font-weight : bolder;

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The API has been updated, now you have to import the desired font-weight using ":wght@700"

Ex: "https://fonts.googleapis.com/css2?family=Inter:wght@700&display=swap"

source: https://developers.google.com/fonts/docs/css2

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you can use the weight value specified in the Google Fonts.

body{
 font-family: 'Heebo', sans-serif;
 font-weight: 100;
}

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In case anyone is looking for latest format with multiple font families + weights, see below (ex. w/ Open Sans + Roboto)

https://fonts.googleapis.com/css2?family=Open+Sans:ital,wght@0,300;0,400;0,600;0,700;0,800;1,800&family=Roboto:wght@500&display=swap

Note that the latest version of google fonts web interface has bad UX for displaying the code sample. There is a 'selected families' panel which displays and then disappears, and it overlaps the font variations 'add' buttons (the plus / minus signs), which are also located on the right. The solution, which is not intuitive, is to reload the page.

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