feat(typography): add @material/web/typography/md-typescale classes

Fixes #1050

View the updated [typography docs](https://github.com/material-components/material-web/blob/main/docs/theming/typography.md#classes) for more info.

PiperOrigin-RevId: 613259080

Author: asyncliz

divider/demo/stories.ts

@@ -7,6 +7,7 @@
 import '@material/web/divider/divider.js';
 
 import {MaterialStoryInit} from './material-collection.js';
+import {styles as typescaleStyles} from '@material/web/typography/md-typescale.js';
 import {css, html} from 'lit';
 
 /** Knob types for divider stories. */
@@ -18,25 +19,28 @@ export interface StoryKnobs {
 
 const standard: MaterialStoryInit<StoryKnobs> = {
   name: 'Divider',
-  styles: css`
-    ul {
-      border: 1px solid var(--md-sys-color-outline);
-      margin: 0;
-      padding: 0;
-      width: 256px;
-    }
+  styles: [
+    typescaleStyles,
+    css`
+      ul {
+        border: 1px solid var(--md-sys-color-outline);
+        margin: 0;
+        padding: 0;
+        width: 256px;
+      }
 
-    li {
-      color: var(--md-sys-color-on-background);
-      font-family: system-ui;
-      list-style: none;
-      margin: 16px;
-    }
-  `,
+      li {
+        color: var(--md-sys-color-on-background);
+        list-style: none;
+        margin: 16px;
+      }
+    `,
+  ],
   render(knobs) {
     return html`
       <ul
-        aria-label="A list of items with decorative and non-decorative separators">
+        aria-label="A list of items with decorative and non-decorative separators"
+        class="md-typescale-body-medium">
         <li>List item one</li>
         <md-divider
           ?inset=${knobs.inset}

docs/theming/typography.md

@@ -10,7 +10,7 @@ order: 3
 
 <!--*
 # Document freshness: For more information, see go/fresh-source.
-freshness: { owner: 'lizmitchell' reviewed: '2023-09-06' }
+freshness: { owner: 'lizmitchell' reviewed: '2024-03-05' }
 tag: 'docType:howTo'
 *-->
 
@@ -71,6 +71,36 @@ A
 is a collection of font styles: `font-family`, `font-size`, `line-height`, and
 `font-weight`.
 
+### Classes
+
+<!-- go/md-typescale -->
+
+Typescales can be applied to an element using the classes from the typescale
+stylesheet.
+
+Class names follow the naming convention `.md-typescale-<scale>-<size>`.
+
+```ts
+import {styles as typescaleStyles} from '@material/web/typography/md-typescale.js';
+
+// `typescaleStyles.styleSheet` is a `CSSStyleSheet` that can be added to a
+// document or shadow root's `adoptedStyleSheets` to use the `.md-typescale-*`
+// classes.
+document.adoptedStyleSheets.push(typescaleStyles.styleSheet);
+
+// `typescaleStyles` can also be added to a `LitElement` component's styles.
+class App extends LitElement {
+  static styles = [typescaleStyles, css`...`];
+
+  render() {
+    return html`
+      <h1 class="md-typescale-display-large">Large display</h1>
+      <p class="md-typescale-body-medium">Body text</p>
+    `;
+  }
+}
+```
+
 ### Tokens
 
 Typescales can be set using

iconbutton/demo/stories.ts

@@ -11,6 +11,7 @@ import '@material/web/iconbutton/icon-button.js';
 import '@material/web/iconbutton/outlined-icon-button.js';
 
 import {MaterialStoryInit} from './material-collection.js';
+import {styles as typescaleStyles} from '@material/web/typography/md-typescale.js';
 import {css, html} from 'lit';
 
 /** Knob types for icon button stories. */
@@ -20,33 +21,32 @@ export interface StoryKnobs {
   disabled: boolean;
 }
 
-const styles = css`
-  .column {
-    display: flex;
-    flex-direction: column;
-    align-items: center;
-  }
-
-  .row {
-    display: flex;
-    gap: 32px;
-  }
-
-  p {
-    color: var(--md-sys-color-on-surface);
-    font: var(--md-sys-typescale-body-medium-weight, 400)
-      var(--md-sys-typescale-body-medium-size, 0.875rem) /
-      var(--md-sys-typescale-body-medium-line-height, 1.25rem)
-      var(--md-sys-typescale-body-medium-font, 'Roboto');
-  }
-`;
+const styles = [
+  typescaleStyles,
+  css`
+    .column {
+      display: flex;
+      flex-direction: column;
+      align-items: center;
+    }
+
+    .row {
+      display: flex;
+      gap: 32px;
+    }
+
+    p {
+      color: var(--md-sys-color-on-surface);
+    }
+  `,
+];
 
 const buttons: MaterialStoryInit<StoryKnobs> = {
   name: 'Icon button variants',
   styles,
   render({icon, disabled}) {
     return html`
-      <div class="row">
+      <div class="row md-typescale-body-medium">
         <div class="column">
           <p>Standard</p>
           <md-icon-button aria-label="Open settings" ?disabled=${disabled}>

labs/card/demo/stories.ts

@@ -10,6 +10,7 @@ import '@material/web/labs/card/filled-card.js';
 import '@material/web/labs/card/outlined-card.js';
 
 import {MaterialStoryInit} from './material-collection.js';
+import {styles as typescaleStyles} from '@material/web/typography/md-typescale.js';
 import {css, html} from 'lit';
 
 /** Knob types for card stories. */
@@ -18,45 +19,44 @@ export interface StoryKnobs {}
 const MEDIA_IMAGE =
   'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAALwAAAC8CAYAAADCScSrAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAlHSURBVHgB7d0HbxtHFsDxJ1Hdala15CaXxL44TmLg7vt/gQNyJbmzZUqkOtVFFVLd4dsUO4oKy+7szL7/DzCSAEESI3+uZme5b9pm88VPAhjRLoAhBA9TCB6mEDxMIXiYQvAwheBhCsHDFIKHKQQPUwgephA8TCF4mELwMIXgYQrBwxSChykED1MIHqYQPEwheJhC8DCF4GEKwcMUgocpBA9TCB6mEDxM6RA4sb6xKYdHRzI+NiqDAwOCdBC8A6trJZmdm4/+fKX25/9494P09vYI3GNJk7DT0zMpLi398deXl5eSLxQE6SD4hBUXF6Pov7S9sys7u7sC9wg+QbpmL9XW7tfJzxfl0yfOonCN4BOUny9ES5jrVKpVWV5dFbhF8AnZ2NySvfL+rX/PwtJybblzKnCH4BOgV/W5QvHOv+/8/ELmi4sCdwg+AXrlPqnzyl3a2JD9gwOBGwQfs+PjE1laaWxtrmt9bmDdIPiY6R77TTeqN9k/OIyu9EgewcdI99a3tnekGYWFxdqa/lyQLIKPiV7VW7kB1YdTuvZHsgg+Jqul9ehBUyuWV9ekUqkKkkPwMdCrsy5JWqU3rh/n5wXJIfgYFBYW5OLiQuKwu1eu3QdsC5JB8C3SZczaerw7LHOFhYZ3elAfgm/R+9m8xK16fCyLyyuC+BF8C0q1K3urN6o30eBPTvieTdwIvknRNmRt7Z7oP7+Y3D/fKoJvksZ49cWOuK1vbspeuSyID8E34eioEu27u/Bxju/ZxIngm6BLGVe7KEeVSm0XyM2HywKCb5B+V0bfSXVJl098zyYeBN+AaOLAvPuJA/qiSD0vlOBuBN8A/a7L8cmJpKH02yAntIbg6xTNl1lckrTojWsaP12yhuDrdNsEAlf0pfD1G8Z+oD4EX4fy/r5sbG2JD/QGNq4vqllE8HeIvrI7589SQl8O53s2zSP4O6zF8GJH3PQl8Wr1WNA4gr/F1UGovmAga/MI/hbXDUL1BQNZm0PwN7htEKovGMjaOIK/gQ/bkHdhIGvjCP4a9QxC9QUDWRtD8FfUOwjVFwxkbQzBX9HIIFRfMJC1fgT/hWYGofqCgaz1IfgvNDMI1RcMZK0Pwf+mlUGovmAg690IXlofhOoLBrLejeAlnkGovmAg6+3MBx/XIFRfMJD1duaDj3MQqi8YyHoz08EnMQjVFwxkvZ7p4JMYhOoLBrJez2zwSQ5C9QUDWf/KZPBJD0L1BQNZ/8pk8C4GofqCgax/Zi54l4NQfcFA1s/MBe9yEKovGMj6mangdX/a9SBUX+gyjqu8seAt70tfXhK7MhX8yP1hmRgbE2va2trkxczT6I/Wtc3mi+Y++vpVAks/3tvb26NfEOkQg3K5nMAmPvYwheBhCsHDFIKHKQQPUwgephA8TCF4mELwMIXgYQrBwxSChykED1MIHqYQPEwheJhC8DDF5BtP+ExPDNE5lHr0pY7l+/1Fd33/taOjQ7q6OqW3p0d6ar+ygOCN0cB1VMluuSzl8n4Uez1yuXbpv3dPhoeGopfhhwYHJUQmX+K2Rl9Y1/Or9NCznd29WF5g7+7uksnxcZl+8KB29e+WUBB8hmnY6xub0blP9V7JmzE2OiIzTx5HPwF85zR4/XGqcx1DPip9oL9fJifGxXfbOzuSny8mGvpVU5MT8uzpk9q6v0t85XQN/9P/38tebd0YutOzM3n8cFp8pBcVPaS4VLuyu6anqWzv7srLZ89kYtzPgVdOtyWzELsqe/r7ODg8lH/++O9UYv+djiH/34dZ+Tg37+VoQ3ZpMkJvSjU0XyJbWStJpVqVb159LZ2dneILHjxlwGotrp/ff/DuiqrTmn/8z09e3bMRfOB0F2a2tnzwdVamXuX/9d+fvYme4AOme+of8nPiO43el+UWwQfq+PikFpF/y5ib6IaF3simjeADpJHrmv38PKwTxHXbUp/2pongA6Tnr+oWZIj0GUGaZ8cSfGB0KRPyCdv6UynNs2MJPjD5QiH4s6rSPDuW4ANyeHQUPWDKguLikqSB4AOytLwqWaG7NvoBdo3gA3F2diab29uSJSurJXGN4AOxsbWVuXNmN7e3nD8hJvhAbGxm6+qudMdGnxa7RPAB0O+47x8cSBbpiyouEXwA9g8OM3uQsut3JAg+AKE+Va2HvoKoJ6O7QvABSGP7zhX9yXVUqYgrBB+AatXdi9hpcPn7I/gAhDzloR76UrwrBB+A84uwvgbcKN2FcoXgA5C1B05XcdMKU3RwqysEH4BcLidZ5vL3R/AB6OzI9vigLodzawg+AN3d4UznbYbLWZQEH4C+3l7Jst5ed4ctEHwA+vv7JKt0/e7yA03wARgcGJCsGui/xy4N/kwPGujoyOZOjR6h4xLBB0CvgKMjI5JFoyP3xSWCD8TEmJ8HDLRCTwfUE1VcIvhA6Ml5PRnbnpx6MCmuEXwgdFnzYHJCsqK9vT06E8r5v1cQjEfTU5m5eZ2uXd3TOBmE4AOiJ2M/mvbzMLVG6NX9yaOHkgaCD4yG0hv4MfDPZ9I72pLgA6NXx1dfvZBQ6TMFPb07LQQfIH1Y4+s5sbfRD+ub16+iP6b23yAIkp54PTw0KCF5/dVLp18Uuw7BB0qvknoGaih78zNPHntxOjfBB0xv/H54+6330evyS4P3AcEHrqen2+vodVfpxbMZ8QXBZ4BG/+67tzI06M/XiPXJsIb+fOap+MRp8GnencfJx99Hd3eXfP/tm+gJZur/LbWl1ndv/ublTpLT/3NPHz+S0OVy7TI9lX5U19EP4tcvX8jbb15H0aVhcnxc/v7ue7k/PCw+apvNF53OYdYzOs/O3Y1Wi5uulTsCmCKgw5sKC4uyslZyMshJHyi9fD7j/IWORjkPHm6dnp7J4vJydAJ2Eid3633Dw6kpGR8bdfqqXrMI3gi9ym9sbkVnRekhBK1c9fWnnAau++quX+BoFcEbpLMcy/sHtV+/Hh1ZqVTl5PT02g+BDoHSp6N9fX0yONBfu6IPyr2+cKcoEDz+oB+Ei4vL6JACvTnXERohLFMake0ZbmiIBp71OZY8eIIpBA9TCB6mEDxMIXiYQvAwheBhCsHDFIKHKQQPUwgephA8TCF4mELwMIXgYQrBwxSChykED1MIHqYQPEwheJhC8DCF4GEKwcMUgocpBA9TfgF+si70ZYTauwAAAABJRU5ErkJggg==';
 
-const styles = css`
-  .container {
-    display: flex;
-    flex-wrap: wrap;
-    gap: 8px;
-    color: var(--md-sys-color-on-surface);
-    font: var(--md-sys-typescale-body-medium-weight, 400)
-      var(--md-sys-typescale-body-medium-size, 0.875rem) /
-      var(--md-sys-typescale-body-medium-line-height, 1.25rem)
-      var(--md-sys-typescale-body-medium-font, 'Roboto');
-  }
+const styles = [
+  typescaleStyles,
+  css`
+    .container {
+      display: flex;
+      flex-wrap: wrap;
+      gap: 8px;
+      color: var(--md-sys-color-on-surface);
+    }
 
-  .card {
-    width: 192px;
-  }
+    .card {
+      width: 192px;
+    }
 
-  img {
-    border-radius: inherit;
-    background: #dadce0;
-    object-fit: contain;
-    height: 128px;
-  }
+    img {
+      border-radius: inherit;
+      background: #dadce0;
+      object-fit: contain;
+      height: 128px;
+    }
 
-  .content {
-    display: flex;
-    flex-direction: column;
-    flex: 1;
-    justify-content: space-between;
-    padding: 16px;
-    gap: 16px;
-  }
-`;
+    .content {
+      display: flex;
+      flex-direction: column;
+      flex: 1;
+      justify-content: space-between;
+      padding: 16px;
+      gap: 16px;
+    }
+  `,
+];
 
 const cards: MaterialStoryInit<StoryKnobs> = {
   name: 'Cards',
   styles,
   render() {
     return html`
-      <div class="container">
+      <div class="container md-typescale-body-medium">
         <md-elevated-card class="card">
           <img src=${MEDIA_IMAGE} alt="Placeholder image" />
           <div class="content">A static elevated card</div>
@@ -81,7 +81,7 @@ const withActions: MaterialStoryInit<StoryKnobs> = {
   styles,
   render() {
     return html`
-      <div class="container">
+      <div class="container md-typescale-body-medium">
         <md-elevated-card class="card">
           <img src=${MEDIA_IMAGE} alt="Placeholder image" />
           <div class="content">