css/docs/content/utilities/typography.md

title	path	status	source	bundle
Typography	utilities/typography	Stable	https://github.com/primer/css/tree/master/src/utilities/typography.scss	utilities

Type utilities are designed to work in combination with line-height utilities so as to result in more sensible numbers wherever possible. These also exist as variables that you can use in components or custom CSS.

Font sizes are smaller on mobile and scale up at the md breakpoint to be larger on desktop.

Scale	Font size: mobile	Font size: desktop	1.25 line height	1.5 line height
00	40px	48px	60	72
0	32px	40px	50	60
1	26px	32px	40	48
2	22px	24px	30	36
3	18px	20px	25	30
4	16px	16px	20	24
5	14px	14px	17.5	21
6	12px	12px	15	18

Heading utilities

Use .h1 – .h6 to change an elements font size and weight to match our heading styles.

<p class="h1">Pizza 1</p>
<p class="h2">Pizza 2</p>
<p class="h3">Pizza 3</p>
<p class="h4">Pizza 4</p>
<p class="h5">Pizza 5</p>
<p class="h6">Pizza 6</p>

These are particularly useful for changing the visual appearance while keeping the markup semantically correct. Be sure you keep the hierarchy appropriate for the page.

<h2 class="h1">Looks like a heading 1, semantically a heading 2</h2>

Type scale utilities

Use .f1 – .f6 to change an elements font size while keeping inline with our type scale.

<p class="f1">Focaccia</p>
<p class="f2">Focaccia</p>
<p class="f3">Focaccia</p>
<p class="f4">Focaccia</p>
<p class="f5">Focaccia</p>
<p class="f6">Focaccia</p>

Lighter font-weight utilities are available in a limited range. Lighter font-weights reduce the legibility of text, particularly at small font sizes, so the scale only goes down to f3 at 20px. The larger sizesf0 and f00 allow for lighter and larger type that is in keeping with our marketing styles.

<h1 class="f00-light">Potato chips</h1>
<h1 class="f0-light">Potato chips</h1>
<h1 class="f1-light">Potato chips</h1>
<h1 class="f2-light">Potato chips</h1>
<h1 class="f3-light">Potato chips</h1>

Line height styles

Change the line height density with these utilities. Responsive variants are also available (e.g. .lh-sm-condensed).

<p class="lh-default">
  Bacon ipsum dolor amet tri-tip chicken kielbasa, cow swine beef corned beef ground round prosciutto hamburger porchetta sausage alcatra tail. Jowl chuck biltong flank meatball, beef short ribs. Jowl tenderloin ground round, short loin tri-tip ribeye picanha filet mignon pig chicken kielbasa t-bone fatback. Beef ribs meatball chicken corned beef salami.
</p>
<p class="lh-condensed">
  Bacon ipsum dolor amet tri-tip chicken kielbasa, cow swine beef corned beef ground round prosciutto hamburger porchetta sausage alcatra tail. Jowl chuck biltong flank meatball, beef short ribs. Jowl tenderloin ground round, short loin tri-tip ribeye picanha filet mignon pig chicken kielbasa t-bone fatback. Beef ribs meatball chicken corned beef salami.
</p>
<p class="lh-condensed-ultra">
  Bacon ipsum dolor amet tri-tip chicken kielbasa, cow swine beef corned beef ground round prosciutto hamburger porchetta sausage alcatra tail. Jowl chuck biltong flank meatball, beef short ribs. Jowl tenderloin ground round, short loin tri-tip ribeye picanha filet mignon pig chicken kielbasa t-bone fatback. Beef ribs meatball chicken corned beef salami.
</p>

The lh-0 utility class sets line-height: 0 !important, and can be used to remove vertical spacing from elements that inherit line-height but don't contain any text.

Typographic styles

Change the font weight, styles, and alignment with these utilities.

<p class="text-normal">Normal</p>
<p class="text-italic">Italic</p>
<p class="text-bold">Bold</p>
<p class="text-uppercase">Uppercase</p>
<p class="no-wrap">No wrap</p>
<p class="ws-normal">Normal whitespace</p>
<p class="text-underline">Text underline</p>
<p class="no-underline">No underline</p>
<p class="text-emphasized">Emphasized</p>
<p class="text-small">Small</p>
<p class="lead">Bacon ipsum dolor amet tri-tip chicken kielbasa, cow swine beef corned beef ground round prosciutto hamburger porchetta sausage alcatra tail.</p>
<p class="text-mono">Monospace</p>
<p class="user-select-none">User Select None</p>

Word-break

There are two utilities for adjusting how lines and words of text break when they exceed the width of their containing element:

1. break-word sets word-break: break-word and overflow-wrap: break-word, which will only break words if they would exceed the line length after wrapping.

2. wb-break-all sets word-break: break-all, which will force a word to break regardless of whether it's shorter than the line length. See MDN's word-break docs for more info.

<p class="break-word p-2 bg-gray col-3 border-right">.break-word will only break long words that exceed the line length, such as supercalifragilisticexpialidocious. Long words like "exceedingly" will simply break to the next line.</p>
<p class="wb-break-all p-2 bg-gray col-3 border-right">.wb-break-all will break any word that meets the end its line, and should be used sparingly. As you can see here, it's not particularly nice to read text that breaks in weird places.</p>

Text alignment

Use text alignment utilities to left align, center, or right align text.

<p class="text-left">Left align</p>
<p class="text-center">Center</p>
<p class="text-right">Right align</p>

Responsive text alignment

Use the following formula to make a text alignment utility responsive: .text-[breakpoint]-[alignment]

<p class="text-left text-sm-center text-lg-right">Left in a small viewport, centered in mid-sized viewports, and right aligned in larger viewports</p>

List styles

Remove bullets from an unordered list or numbers from an ordered list by applying .list-style-none to the <ul>.

<ul class="list-style-none">
  <li>First list item</li>
  <li>Second list item</li>
  <li>Third list item</li>
</ul>

Text Shadows

Text shadows can be used to help readability and to add some depth on colored backgrounds.

<div class="bg-gray-dark p-5">
  <h3 class="text-white text-shadow-dark">.text-shadow-dark helps white text stand out on dark or photographic backgrounds</h3>
</div>
<div class="bg-gray p-5">
  <h3 class="text-shadow-light">.text-shadow-light creates an embossed effect for dark text</h3>
</div>