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UX: Add category & section for syntax & BEM (#24516)
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Jordan Vidrine
GitHub
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<div class="section-description">
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<p>
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The guidelines outlines below strive to bring structure and consistency to
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our classnames. Additionally, with this approach the nesting of css is
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firmly reduced. BEM stands for:
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<ul>
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<li>Block</li>
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<li>Element</li>
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<li>Modifier</li>
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</ul>
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</p>
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<p>We use a slightly modified version of the BEM classname format.</p>
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<h3>Block</h3>
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For example
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<strong><code>d-modal</code></strong>
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<p>A block is a standalone component. Blocks can be used within blocks. It
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should be a "top-level" element, which could be used in its entirety in
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another place of the app. It has no dependencies on any parent class.</p>
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<h3>Element</h3>
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For example
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<strong><code>d-modal__header</code></strong>
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<p>
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An element is a part of a block that can not be used outside that context.
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They because it depends on the parent class and can not be used standalone
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outside this context. In the example above, an element with class
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<code>d-modal__header</code>
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will only work within the d-modal block, but not when placed elsewhere.
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</p>
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<h3>Modifiers</h3>
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Examples
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<strong><code>--success</code>,
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<code>--large</code>,<code>--inline</code>,
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<code>--highlighted</code></strong>
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<p>
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A modifier is used mainly for changing the appearance, if different than the
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default. It is less than an element, and has no html structure of it own.
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Meaning, it can only exist when applied to an element (or potentially a
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block).
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</p>
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<p>In classic BEM, a modifier looks like:
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<code>d-modal__header--success</code>. This can quickly turn into very
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verbose HTML. Imagine an already long block-element name, for example:
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<p>
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<code>class="chat-message-creator__search-container"</code>
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</p>
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With classic BEM and 2 modifiers, it would look like this:
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<p>
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<code>class="chat-message-creator__search-container
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chat-message-creator__search-container--highlighted
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chat-message-creator__search-container--inline"</code>
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</p>
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To avoid this, we decouple our modifiers from the BE parts of the classnames
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and use them as separate classes. So in the previous case with 2 modifiers
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this turns into:
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<p>
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<code>class="chat-message-creator__search-container --highlighted
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--inline"</code>
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</p>
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which is far more readable.
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</p>
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<h4>Special modifiers</h4>
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Some special prefixes are useful to identify modifiers as temporary states or
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condition. These are:
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<ul>
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<li><code>is-foo</code> = example: is-open</li>
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<li><code>has-foo</code> = example: has-errors</li>
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</ul>
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<h3>In Code</h3>
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<p>Even though the BEM convention avoids nesting, we can use SCSS to write the
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code nested. This is to taste, but I find it easier to read and write,
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because it will keep all relevant elements and modifiers grouped together
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and avoids unnecessary repetition of the block class.</p>
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</div>
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@ -36,13 +36,15 @@ import navigation from "../components/sections/organisms/navigation";
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import siteHeader from "../components/sections/organisms/site-header";
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import suggestedTopics from "../components/sections/organisms/suggested-topics";
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import userAbout from "../components/sections/organisms/user-about";
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import bem from "../components/sections/syntax/00-bem";
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let _allCategories = null;
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let _sectionsById = {};
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export const CATEGORIES = ["atoms", "molecules", "organisms"];
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export const CATEGORIES = ["syntax", "atoms", "molecules", "organisms"];
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const SECTIONS = [
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{ component: bem, category: "syntax", id: "bem", priority: 0 },
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{ component: typography, category: "atoms", id: "typography", priority: 0 },
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{ component: fontScale, category: "atoms", id: "font-scale", priority: 1 },
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{ component: buttons, category: "atoms", id: "buttons", priority: 2 },
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@ -2,84 +2,4 @@
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<div class="description">
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{{i18n "styleguide.welcome"}}
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</div>
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<h1>Syntax</h1>
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<h2>BEM</h2>
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<p>
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The guidelines outlines below strive to bring structure and consistency to
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our classnames. Additionally, with this approach the nesting of css is
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firmly reduced. BEM stands for:
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<ul>
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<li>Block</li>
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<li>Element</li>
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<li>Modifier</li>
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</ul>
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</p>
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<p>We use a slightly modified version of the BEM classname format.</p>
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<h3>Block</h3>
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For example
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<strong><code>d-modal</code></strong>
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<p>A block is a standalone component. Blocks can be used within blocks. It
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should be a "top-level" element, which could be used in its entirety in
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another place of the app. It has no dependencies on any parent class.</p>
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<h3>Element</h3>
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For example
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<strong><code>d-modal__header</code></strong>
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<p>
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An element is a part of a block that can not be used outside that context.
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They because it depends on the parent class and can not be used standalone
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outside this context. In the example above, an element with class
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<code>d-modal__header</code>
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will only work within the d-modal block, but not when placed elsewhere.
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</p>
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<h3>Modifiers</h3>
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Examples
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<strong><code>--success</code>,
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<code>--large</code>,<code>--inline</code>,
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<code>--highlighted</code></strong>
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<p>
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A modifier is used mainly for changing the appearance, if different than the
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default. It is less than an element, and has no html structure of it own.
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Meaning, it can only exist when applied to an element (or potentially a
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block).
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</p>
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<p>In classic BEM, a modifier looks like:
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<code>d-modal__header--success</code>. This can quickly turn into very
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verbose HTML. Imagine an already long block-element name, for example:
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<p>
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<code>class="chat-message-creator__search-container"</code>
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</p>
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With classic BEM and 2 modifiers, it would look like this:
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<p>
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<code>class="chat-message-creator__search-container
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chat-message-creator__search-container--highlighted
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chat-message-creator__search-container--inline"</code>
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</p>
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To avoid this, we decouple our modifiers from the BE parts of the classnames
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and use them as separate classes. So in the previous case with 2 modifiers
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this turns into:
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<p>
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<code>class="chat-message-creator__search-container --highlighted
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--inline"</code>
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</p>
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which is far more readable.
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</p>
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<h4>Special modifiers</h4>
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Some special prefixes are useful to identify modifiers as temporary states or
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condition. These are:
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<ul>
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<li><code>is-foo</code> = example: is-open</li>
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<li><code>has-foo</code> = example: has-errors</li>
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</ul>
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<h3>In Code</h3>
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<p>Even though the BEM convention avoids nesting, we can use SCSS to write the
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code nested. This is to taste, but I find it easier to read and write,
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because it will keep all relevant elements and modifiers grouped together
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and avoids unnecessary repetition of the block class.</p>
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</StyleguideSection>
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@ -5,11 +5,14 @@ en:
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welcome: "To get started, choose a section from the menu on the left."
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categories:
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syntax: Syntax
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atoms: Atoms
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molecules: Molecules
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organisms: Organisms
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sections:
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bem:
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title: "BEM"
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typography:
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title: "Typography"
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example: "Welcome to Discourse"
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