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Library</a><ul class="menu"><li><a href="#" data-toggle="dropdown-1" unselectable="on" class="dropdown-toggle">files</a><ul id="dropdown-1" hidden class="dropdown"><li><a href="actions-toolbar.html">actions-toolbar</a></li><li><a href="breadcrumbs.html">breadcrumbs</a></li><li><a href="buttons.html">buttons</a></li><li><a href="components.html">components</a></li><li><a href="dropdowns.html">dropdowns</a></li><li><a href="forms.html">forms</a></li><li><a href="icons.html">icons</a></li><li><a href="layout.html">layout</a></li><li><a href="lib.html">lib</a></li><li><a href="loaders.html">loaders</a></li><li><a href="messages.html">messages</a></li><li><a href="pages.html">pages</a></li><li><a href="popups.html">popups</a></li><li><a href="rating.html">rating</a></li><li><a href="resets.html">resets</a></li><li><a href="responsive.html">responsive</a></li><li><a href="sections.html">sections</a></li><li><a href="tables.html">tables</a></li><li><a href="tooltips.html">tooltips</a></li><li><a href="typography.html">typography</a></li><li><a href="utilities.html">utilities</a></li><li><a href="variables.html">variables</a></li><li><a href="docs.html">docs</a></li></ul></li></ul><div class="nav"><button title="Table of Contents" data-toggle="nav-toc"><svg viewBox="0 0 512 512" height="22" width="22" class="icon"><path d="M108.9,403.1V462H50v-58.9H108.9z M108.9,285.4H50v58.9h58.9V285.4zM108.9,50H50v58.9h58.9V50z M108.9,167.7H50v58.9h58.9V167.7z M167.7,344.3H462v-58.9H167.7V344.3zM167.7,50v58.9H462V50H167.7z M167.7,462H462v-58.9H167.7V462z M167.7,226.6H462v-58.9H167.7V226.6z"></path></svg></button><input type="search" placeholder="Search" class="search"></div></div></nav><section class="container"><article id="magento-ui-library" class="section"><div class="docs"><a href="#magento-ui-library" class="permalink"><svg viewBox="0 0 512 512" height="32" width="32" class="icon"><path d="M156.2,199.7c7.5-7.5,15.9-13.8,24.8-18.7c49.6-27.3,113.1-12.8,145,35.5l-38.5,38.5c-11.1-25.2-38.5-39.6-65.8-33.5c-10.3,2.3-20.1,7.4-28,15.4l-73.9,73.9c-22.4,22.4-22.4,58.9,0,81.4c22.4,22.4,58.9,22.4,81.4,0l22.8-22.8c20.7,8.2,42.9,11.5,64.9,9.9l-50.3,50.3c-43.1,43.1-113,43.1-156.1,0c-43.1-43.1-43.1-113-0-156.1L156.2,199.7z M273.6,82.3l-50.3,50.3c21.9-1.6,44.2,1.6,64.9,9.9l22.8-22.8c22.4-22.4,58.9-22.4,81.4,0c22.4,22.4,22.4,58.9,0,81.4l-73.9,73.9c-22.5,22.5-59.1,22.3-81.4,0c-5.2-5.2-9.7-11.7-12.5-18l-38.5,38.5c4,6.1,8.3,11.5,13.7,16.9c13.9,13.9,31.7,24.3,52.1,29.3c26.5,6.4,54.8,2.8,79.2-10.6c8.9-4.9,17.3-11.1,24.8-18.7l73.9-73.9c43.1-43.1,43.1-113,0-156.1C386.6,39.2,316.7,39.2,273.6,82.3z"></path></svg></a><h1 id="magento-ui-library">Magento UI library</h1>
<p>The Magento UI library is a flexible modular Magento frontend library that is designed to assist Magento theme developers. It employs a set of mixins for base elements to ease frontend theme development and customization. The Magento UI library offers the following characteristics for those who develop or customize Magento themes. It is:</p>
<ul>
<li>Built on LESS preprocessor</li>
<li>Focused on web standards</li>
<li>Customizable</li>
<li>Easy to maintain</li>
<li>Responsive</li>
<li>Accessible</li>
</ul>
<p>The library provides the ability to customize all of the following user interface elements:</p>
<ul>
<li>actions-toolbar</li>
<li>breadcrumbs</li>
<li>buttons</li>
<li>components</li>
<li>drop-downs</li>
<li>forms</li>
<li>icons</li>
<li>layout</li>
<li>loaders</li>
<li>messages</li>
<li>pagination</li>
<li>popups</li>
<li>ratings</li>
<li>resets</li>
<li>responsive</li>
<li>sections -  tabs and accordions</li>
<li>tables</li>
<li>tooltips</li>
<li>typography</li>
<li>utilities</li>
<li>list of theme variables</li>
</ul>
</div></article><article id="magento-ui-library-file-structure" class="section"><div class="docs"><a href="#magento-ui-library-file-structure" class="permalink"><svg viewBox="0 0 512 512" height="32" width="32" class="icon"><path d="M156.2,199.7c7.5-7.5,15.9-13.8,24.8-18.7c49.6-27.3,113.1-12.8,145,35.5l-38.5,38.5c-11.1-25.2-38.5-39.6-65.8-33.5c-10.3,2.3-20.1,7.4-28,15.4l-73.9,73.9c-22.4,22.4-22.4,58.9,0,81.4c22.4,22.4,58.9,22.4,81.4,0l22.8-22.8c20.7,8.2,42.9,11.5,64.9,9.9l-50.3,50.3c-43.1,43.1-113,43.1-156.1,0c-43.1-43.1-43.1-113-0-156.1L156.2,199.7z M273.6,82.3l-50.3,50.3c21.9-1.6,44.2,1.6,64.9,9.9l22.8-22.8c22.4-22.4,58.9-22.4,81.4,0c22.4,22.4,22.4,58.9,0,81.4l-73.9,73.9c-22.5,22.5-59.1,22.3-81.4,0c-5.2-5.2-9.7-11.7-12.5-18l-38.5,38.5c4,6.1,8.3,11.5,13.7,16.9c13.9,13.9,31.7,24.3,52.1,29.3c26.5,6.4,54.8,2.8,79.2-10.6c8.9-4.9,17.3-11.1,24.8-18.7l73.9-73.9c43.1-43.1,43.1-113,0-156.1C386.6,39.2,316.7,39.2,273.6,82.3z"></path></svg></a><h1 id="magento-ui-library-file-structure">Magento UI library file structure</h1>
<p>Magento UI library is located under <code>/lib/web/</code> folder. It and employs:</p>
<ul>
<li><code>css/</code> folder where the library files are placed</li>
<li><code>fonts/</code> folder where default and icon fonts are placed</li>
<li><code>images/</code> folder where default images are placed</li>
<li><code>jquery/</code> folder where jQuery and jQuery widgets are placed</li>
</ul>
<h3 id="magento-ui-library-structure">Magento UI library structure</h3>
<pre><code class="lang-css">/lib/web/
    ├── css/
    │    ├── docs/ (Library documentation)
    │    │    ├── source/
    │    │    │    ├── _actions-toolbar.less
    │    │    │    ├── _breadcrumbs.less
    │    │    │    ├── _buttons.less
    │    │    │    ├── _dropdowns.less
    │    │    │    ├── _forms.less
    │    │    │    ├── _icons.less
    │    │    │    ├── _layout.less
    │    │    │    ├── _lib.less
    │    │    │    ├── _loaders.less
    │    │    │    ├── _messages.less
    │    │    │    ├── _pages.less
    │    │    │    ├── _popups.less
    │    │    │    ├── _rating.less
    │    │    │    ├── _resets.less
    │    │    │    ├── _responsive.less
    │    │    │    ├── _sections.less
    │    │    │    ├── _tables.less
    │    │    │    ├── _tooltips.less
    │    │    │    ├── _typography.less
    │    │    │    ├── _utilities.less
    │    │    │    ├── _variables.less
    │    │    │    ├── _components.less
    │    │    │    ├── docs.less
    │    │    │    └── README.md
    │    │    ├─── extends.html
    │    │    ├─── actions-toolbar.html
    │    │    ├─── breadcrumbs.html
    │    │    ├─── buttons.html
    │    │    ├─── components.html
    │    │    ├─── docs.css
    │    │    ├─── docs.html
    │    │    ├─── dropdowns.html
    │    │    ├─── forms.html
    │    │    ├─── icons.html
    │    │    ├─── index.html
    │    │    ├─── layout.html
    │    │    ├─── lib.html
    │    │    ├─── loaders.html
    │    │    ├─── messages.html
    │    │    ├─── pages.html
    │    │    ├─── popups.html
    │    │    ├─── rating.html
    │    │    ├─── resets.html
    │    │    ├─── responsive.html
    │    │    ├─── sections.html
    │    │    ├─── tables.html
    │    │    ├─── tooltips.html
    │    │    ├─── typography.html
    │    │    ├─── utilities.html
    │    │    └─── variables.html
    │    └── source/
    │          ├── components/ (Reusable components files)
    │          │    └── _modals.less
    │          ├── lib/ (Library source files)
    │          │    └── variables/ (Decoupled variables)
    │          │          └── ...
    │          │    ├── _extends.less
    │          │    ├── _actions-toolbar.less
    │          │    ├── _breadcrumbs.less
    │          │    ├── _buttons.less
    │          │    ├── _dropdowns.less
    │          │    ├── _forms.less
    │          │    ├── _icons.less
    │          │    ├── _layout.less
    │          │    ├── _lib.less
    │          │    ├── _loaders.less
    │          │    ├── _messages.less
    │          │    ├── _navigation.less
    │          │    ├── _pages.less
    │          │    ├── _popups.less
    │          │    ├── _rating.less
    │          │    ├── _resets.less
    │          │    ├── _responsive.less
    │          │    ├── _sections.less
    │          │    ├── _tables.less
    │          │    ├── _tooltips.less
    │          │    ├── _typography.less
    │          │    ├── _utilities.less
    │          │    └── _variables.less
    │          ├── _extend.less
    │          └── _theme.less
    ├── fonts/
    │    └── Blank-Theme-Icons/ (Library custom icons font)
    ├── images/
    │    └── blank-theme-icons.png (Library icons sprite)
    └── jquery/ (Library javascript files)</code></pre>
<p>&nbsp;</p>
</div></article><article id="magento-ui-library-naming-convention" class="section"><div class="docs"><a href="#magento-ui-library-naming-convention" class="permalink"><svg viewBox="0 0 512 512" height="32" width="32" class="icon"><path d="M156.2,199.7c7.5-7.5,15.9-13.8,24.8-18.7c49.6-27.3,113.1-12.8,145,35.5l-38.5,38.5c-11.1-25.2-38.5-39.6-65.8-33.5c-10.3,2.3-20.1,7.4-28,15.4l-73.9,73.9c-22.4,22.4-22.4,58.9,0,81.4c22.4,22.4,58.9,22.4,81.4,0l22.8-22.8c20.7,8.2,42.9,11.5,64.9,9.9l-50.3,50.3c-43.1,43.1-113,43.1-156.1,0c-43.1-43.1-43.1-113-0-156.1L156.2,199.7z M273.6,82.3l-50.3,50.3c21.9-1.6,44.2,1.6,64.9,9.9l22.8-22.8c22.4-22.4,58.9-22.4,81.4,0c22.4,22.4,22.4,58.9,0,81.4l-73.9,73.9c-22.5,22.5-59.1,22.3-81.4,0c-5.2-5.2-9.7-11.7-12.5-18l-38.5,38.5c4,6.1,8.3,11.5,13.7,16.9c13.9,13.9,31.7,24.3,52.1,29.3c26.5,6.4,54.8,2.8,79.2-10.6c8.9-4.9,17.3-11.1,24.8-18.7l73.9-73.9c43.1-43.1,43.1-113,0-156.1C386.6,39.2,316.7,39.2,273.6,82.3z"></path></svg></a><h1 id="magento-ui-library-naming-convention">Magento UI library naming convention</h1>
<p>Magento UI library employs a variables and mixins naming convention whereby names of variables and mixins describe their purpose or functions they perform.</p>
<p>A variable or a mixins name may only contain lowercase alphanumeric characters, &quot;-&quot; and &quot;_&quot; characters. A variable name must start with &quot;@&quot; character.</p>
<p>If a variable or mixins name consists of more than one word, they must be concatenated with one hyphen character.</p>
</div></article><article id="less-variables-naming" class="section"><div class="docs"><a href="#less-variables-naming" class="permalink"><svg viewBox="0 0 512 512" height="32" width="32" class="icon"><path d="M156.2,199.7c7.5-7.5,15.9-13.8,24.8-18.7c49.6-27.3,113.1-12.8,145,35.5l-38.5,38.5c-11.1-25.2-38.5-39.6-65.8-33.5c-10.3,2.3-20.1,7.4-28,15.4l-73.9,73.9c-22.4,22.4-22.4,58.9,0,81.4c22.4,22.4,58.9,22.4,81.4,0l22.8-22.8c20.7,8.2,42.9,11.5,64.9,9.9l-50.3,50.3c-43.1,43.1-113,43.1-156.1,0c-43.1-43.1-43.1-113-0-156.1L156.2,199.7z M273.6,82.3l-50.3,50.3c21.9-1.6,44.2,1.6,64.9,9.9l22.8-22.8c22.4-22.4,58.9-22.4,81.4,0c22.4,22.4,22.4,58.9,0,81.4l-73.9,73.9c-22.5,22.5-59.1,22.3-81.4,0c-5.2-5.2-9.7-11.7-12.5-18l-38.5,38.5c4,6.1,8.3,11.5,13.7,16.9c13.9,13.9,31.7,24.3,52.1,29.3c26.5,6.4,54.8,2.8,79.2-10.6c8.9-4.9,17.3-11.1,24.8-18.7l73.9-73.9c43.1-43.1,43.1-113,0-156.1C386.6,39.2,316.7,39.2,273.6,82.3z"></path></svg></a><h1 id="less-variables-naming">Less variables naming</h1>
<p>A *.less file variable can contain lowercase letters, numbers, special characters: &quot;@&quot;, &quot;-&quot; and &quot;_&quot;. It must start with &quot;@&quot; character and consist of words concatenated with one hyphen. It should not contain capital letters. A variable name should describe its purpose.</p>
<p>A variable name should be formed according to the following rule:</p>
<p><code>&#39;@&#39; + &#39;object&#39; + &#39;-&#39; + &#39;property&#39; + &#39;-&#39; + &#39;state&#39; = @object-property-state</code></p>
<p>If it is a private variable (is used only in a mixin), it must start with &quot;_&quot; character after &quot;@&quot;:</p>
<p><code>&#39;@&#39; + &#39;_&#39; + &#39;object&#39; + &#39;-&#39; + &#39;property&#39; + &#39;-&#39; + &#39;state&#39; = @_object-property-state</code></p>
<h4 id="examples">Examples:</h4>
<h5 id="acceptable">Acceptable:</h5>
<pre><code class="lang-css">    @link-color-hover;
    @color-primary;
    @color-2;</code></pre>
<p>Private variables:</p>
<pre><code class="lang-css">    @_padding-left;
    @_font-size;</code></pre>
<h5 id="unacceptable">Unacceptable:</h5>
<pre><code class="lang-css">    @Link-Color-Hover;
    @colorPrimary;
    @color--primary;
    @paddingleft;
    @__font-size;</code></pre>
<p>&nbsp;</p>
</div></article><article id="less-mixins-naming" class="section"><div class="docs"><a href="#less-mixins-naming" class="permalink"><svg viewBox="0 0 512 512" height="32" width="32" class="icon"><path d="M156.2,199.7c7.5-7.5,15.9-13.8,24.8-18.7c49.6-27.3,113.1-12.8,145,35.5l-38.5,38.5c-11.1-25.2-38.5-39.6-65.8-33.5c-10.3,2.3-20.1,7.4-28,15.4l-73.9,73.9c-22.4,22.4-22.4,58.9,0,81.4c22.4,22.4,58.9,22.4,81.4,0l22.8-22.8c20.7,8.2,42.9,11.5,64.9,9.9l-50.3,50.3c-43.1,43.1-113,43.1-156.1,0c-43.1-43.1-43.1-113-0-156.1L156.2,199.7z M273.6,82.3l-50.3,50.3c21.9-1.6,44.2,1.6,64.9,9.9l22.8-22.8c22.4-22.4,58.9-22.4,81.4,0c22.4,22.4,22.4,58.9,0,81.4l-73.9,73.9c-22.5,22.5-59.1,22.3-81.4,0c-5.2-5.2-9.7-11.7-12.5-18l-38.5,38.5c4,6.1,8.3,11.5,13.7,16.9c13.9,13.9,31.7,24.3,52.1,29.3c26.5,6.4,54.8,2.8,79.2-10.6c8.9-4.9,17.3-11.1,24.8-18.7l73.9-73.9c43.1-43.1,43.1-113,0-156.1C386.6,39.2,316.7,39.2,273.6,82.3z"></path></svg></a><h1 id="less-mixins-naming">Less mixins naming</h1>
<p>A less mixin name can contain lowercase letters, numbers, &quot;-&quot; and &quot;_&quot; characters. It should not contain capital letters.</p>
<p>A mixin name can consist of one or several words, concatenated with one hyphen. If the mixin is private, its name must start with the &quot;_&quot; character. Mixin should be named after property or action it describes.</p>
<h4 id="examples">Examples:</h4>
<h5 id="acceptable">Acceptable:</h5>
<pre><code class="lang-css">    .mixin-name() {}
    .transition() {}
    .mixin() {}
    ._button-gradient() {}</code></pre>
<h5 id="unacceptable">Unacceptable:</h5>
<pre><code class="lang-css">    .mixinName() {}
    .__transition() {}
    .MiXiN() {}
    ._button--gradient() {}</code></pre>
<p>&nbsp;</p>
</div></article><article id="less-code-standards" class="section"><div class="docs"><a href="#less-code-standards" class="permalink"><svg viewBox="0 0 512 512" height="32" width="32" class="icon"><path d="M156.2,199.7c7.5-7.5,15.9-13.8,24.8-18.7c49.6-27.3,113.1-12.8,145,35.5l-38.5,38.5c-11.1-25.2-38.5-39.6-65.8-33.5c-10.3,2.3-20.1,7.4-28,15.4l-73.9,73.9c-22.4,22.4-22.4,58.9,0,81.4c22.4,22.4,58.9,22.4,81.4,0l22.8-22.8c20.7,8.2,42.9,11.5,64.9,9.9l-50.3,50.3c-43.1,43.1-113,43.1-156.1,0c-43.1-43.1-43.1-113-0-156.1L156.2,199.7z M273.6,82.3l-50.3,50.3c21.9-1.6,44.2,1.6,64.9,9.9l22.8-22.8c22.4-22.4,58.9-22.4,81.4,0c22.4,22.4,22.4,58.9,0,81.4l-73.9,73.9c-22.5,22.5-59.1,22.3-81.4,0c-5.2-5.2-9.7-11.7-12.5-18l-38.5,38.5c4,6.1,8.3,11.5,13.7,16.9c13.9,13.9,31.7,24.3,52.1,29.3c26.5,6.4,54.8,2.8,79.2-10.6c8.9-4.9,17.3-11.1,24.8-18.7l73.9-73.9c43.1-43.1,43.1-113,0-156.1C386.6,39.2,316.7,39.2,273.6,82.3z"></path></svg></a><h1 id="less-code-standards">Less Code Standards</h1>
<h2 id="general-rules">General rules</h2>
<h3 id="indentation">Indentation</h3>
<p>Please verified that you use spaces instead tabs:</p>
<ul>
<li>Tab size: 4 spaces</li>
<li>Indent size: 4 spaces</li>
<li>Continuation indent: 4 spaces</li>
</ul>
<pre><code class="lang-css">    .nav {
        .nav-item {
            ...
        }
    }</code></pre>
<h3 id="format">Format</h3>
<h4 id="braces">Braces</h4>
<p>Add space before opening brace and line break after. And line break before closing brace.</p>
<h5 id="not-recommended">Not recommended:</h5>
<pre><code class="lang-css">    .nav{color: @nav__color;}</code></pre>
<h5 id="recommended">Recommended:</h5>
<pre><code class="lang-css">    .nav {
        color: @nav__color;
    }</code></pre>
<h4 id="selector-delimiters">Selector delimiters</h4>
<p>Add line break after each selector delimiter. Delimeter shouldn&#39;t have spaces before and after.</p>
<h5 id="not-recommended">Not recommended:</h5>
<pre><code class="lang-css">    .nav, .bar {
        color: @color__base;
    }</code></pre>
<h5 id="recommended">Recommended:</h5>
<pre><code class="lang-css">    .nav,
    .bar {
        color: @color__base;
    }</code></pre>
<h4 id="quotes">Quotes</h4>
<p>Use single quotes</p>
<h5 id="not-recommended">Not recommended:</h5>
<pre><code class="lang-css">    .nav {
        content: &quot;lorem ipsum&quot;;
    }</code></pre>
<h5 id="recommended">Recommended:</h5>
<pre><code class="lang-css">    .nav {
        content: &#39;lorem ipsum&#39;;
    }</code></pre>
<h4 id="combinator-indents">Combinator indents</h4>
<p>Use spaces before and after combinators</p>
<h5 id="not-recommended">Not recommended:</h5>
<pre><code class="lang-css">    .nav+.bar {
        color: @bar__color;
    }

    .nav +.bar {
        color: @bar__color;
    }

    .nav+ .bar {
        color: @bar__color;
    }</code></pre>
<h5 id="recommended">Recommended:</h5>
<pre><code class="lang-css">    .nav + .bar {
        color: @bar__color;
    }</code></pre>
<h4 id="properties-line-break">Properties line break</h4>
<p>Use line break for each property declaration</p>
<h5 id="not-recommended">Not recommended:</h5>
<pre><code class="lang-css">    .nav {
        color: @nav__color; background-color: @nav__background-color;
    }</code></pre>
<h5 id="recommended">Recommended:</h5>
<pre><code class="lang-css">    .nav {
        background-color: @nav__background-color;
        color: @nav__color;
    }</code></pre>
<h4 id="properties-colon-indents">Properties colon indents</h4>
<p>Use no space before property colon, and space after</p>
<h5 id="not-recommended">Not recommended:</h5>
<pre><code class="lang-css">    .nav {
        color : @nav__color;
    }

    .bar {
        color:@bar__color;
    }

    .item {
        color :@item__color;
    }</code></pre>
<h5 id="recommended">Recommended:</h5>
<pre><code class="lang-css">    .nav {
        color: @nav__color;
    }</code></pre>
<h4 id="end-of-file">End of file</h4>
<p>Each less file should be finished with new line</p>
<h4 id="end-of-the-selector">End of the selector</h4>
<p>Each selector should be finished with new line</p>
<h5 id="not-recommended">Not recommended:</h5>
<pre><code class="lang-css">    .nav {
        background-color: @nav__background-color;
    }
    .bar {
        background-color: @bar__background-color;
    }</code></pre>
<h5 id="recommended">Recommended:</h5>
<pre><code class="lang-css">    .nav {
        background-color: @nav__background-color;
    }

    .bar {
        background-color: @bar__background-color;
    }</code></pre>
<h4 id="end-of-the-property-line">End of the property line</h4>
<p>Each property should be finished with semicolon</p>
<h5 id="not-recommended">Not recommended:</h5>
<pre><code class="lang-css">    .nav {
        background-color: @nav__background-color
    }</code></pre>
<h5 id="recommended">Recommended:</h5>
<pre><code class="lang-css">    .nav {
        background-color: @nav__background-color;
    }</code></pre>
<h4 id="important-property">!Important property</h4>
<p>Basically avoid use this property at all, but if you really really need it use the following format:</p>
<h5 id="not-recommended">Not recommended:</h5>
<pre><code class="lang-css">    .jquery-ui-calendar-item {
        background-color: @nav__background-color!important;
    }</code></pre>
<h5 id="recommended">Recommended:</h5>
<pre><code class="lang-css">    .jquery-ui-calendar-item {
        background-color: @nav__background-color !important;
    }</code></pre>
<h3 id="comments">Comments</h3>
<p>Please follow the next format of comments</p>
<pre><code class="lang-css">    //
    //  First level comment
    //  _____________________________________________

    .nav {
        background-color: @nav__background-color;
    }

    //
    //  Second level comment
    //  ---------------------------------------------

    .nav {
        background-color: @nav__background-color;
    }

    //  Comment
    .nav {
        //  New line comment
        background-color: @nav__background-color; // ToDo UI: todo inline comment
        color: @nav__color; // inline comment
    }</code></pre>
<h3 id="selectors">Selectors</h3>
<h4 id="types">Types</h4>
<p>According to browser support standards the oldest browser that we support is IE9+, it means that you can feel free to use almost all CSS3 selectors: descendants, attributes, pseudo classes, structural, pseudo elements, etc.
Exeption: Please avoid to use id selector.</p>
<h5 id="not-recommended">Not recommended:</h5>
<pre><code class="lang-css">    #foo {
        ...
    }</code></pre>
<h5 id="recommended">Recommended:</h5>
<pre><code class="lang-css">    .nav {
        ...
    }

    .nav + bar {
        ...
    }

    .nav:not(.bar) {
        ...
    }</code></pre>
<h3 id="naming">Naming</h3>
<h4 id="standard-classes">Standard classes</h4>
<p>All classes should be written in lowercase, starts with letter (exept helpers), words in classes should be separated with dash (minus sign &#39;-&#39;)</p>
<h5 id="not-recommended">Not recommended:</h5>
<pre><code class="lang-css">    .navBar {
       ...
    }</code></pre>
<h5 id="not-recommended-underscore-separation">Not recommended: underscore separation</h5>
<pre><code class="lang-css">    .nav_bar {
       ...
    }</code></pre>
<h5 id="recommended">Recommended:</h5>
<pre><code class="lang-css">    .nav-bar {
        ...
    }</code></pre>
<h4 id="helper-classes">Helper classes</h4>
<p>Helper classes should be written in lowercase, starts with underscore (&quot;_&quot;)</p>
<h5 id="example">Example:</h5>
<pre><code class="lang-css">    ._active {
        ...
    }</code></pre>
<h3 id="size">Size</h3>
<p>Use class names that are as short as possible but as long as necessary.
Try to convey what class is about while being as brief as possible.
Using class names this way contributes to acceptable levels of understandability and code efficiency.</p>
<h5 id="not-recommended-too-long">Not recommended: too long</h5>
<pre><code class="lang-css">
    .navigation-panel-in-footer {
       ...
    }</code></pre>
<h5 id="not-recommended-too-short">Not recommended: too short</h5>
<pre><code class="lang-css">    .nvpf {
       ...
    }</code></pre>
<h5 id="recommended">Recommended:</h5>
<pre><code class="lang-css">    .nav-bar {
        ...
    }</code></pre>
<h3 id="writing">Writing</h3>
<p>Write selector name together in single line, don&#39;t use concatenation</p>
<h5 id="not-recommended">Not recommended:</h5>
<pre><code class="lang-css">    .product {
        ...
        &amp;-list {
            ...
            &amp;-item {
                ...
            }
        }
    }</code></pre>
<h5 id="recommended">Recommended:</h5>
<pre><code class="lang-css">    .product-list-item {
        ...
    }</code></pre>
<h3 id="meaning">Meaning</h3>
<p><strong>Use meaningful or generic class names.</strong></p>
<p>Instead of presentational or cryptic names, always use class names that reflect the purpose of the element in question, or that are otherwise generic.
Names that are specific and reflect the purpose of the element should be preferred as these are most understandable and the least likely to change.
Generic names are simply a fallback for elements that have no particular or no meaning different from their siblings. They are typically needed as “helpers.”
Using functional or generic names reduces the probability of unnecessary document or template changes.</p>
<h5 id="not-recommended">Not recommended:</h5>
<pre><code class="lang-css">    .foo-1901 {
        ...
    }</code></pre>
<h5 id="not-recommended-presentational">Not recommended: presentational</h5>
<pre><code class="lang-css">    .button-green {
       ...
    }

    .clear {
       ...
    }</code></pre>
<h5 id="recommended-specific">Recommended: specific</h5>
<pre><code class="lang-css">    .category {
        ...
    }
    .category-title {
        ...
    }</code></pre>
<h3 id="type-selectors">Type selectors</h3>
<p><strong>Avoid qualifying class names with type selectors.</strong></p>
<p>Unless necessary (for example with helper classes), do not use element names in conjunction with IDs or classes.
Avoiding unnecessary ancestor selectors is useful for performance reasons.</p>
<h5 id="not-recommended">Not recommended:</h5>
<pre><code class="lang-css">    div.error {
       ...
    }</code></pre>
<h5 id="recommended">Recommended:</h5>
<pre><code class="lang-css">    .error {
        ...
    }</code></pre>
<p>Use type selectors in lowercase</p>
<h5 id="not-recommended">Not recommended:</h5>
<pre><code class="lang-css">    .nav &gt; LI {
       ...
    }</code></pre>
<h5 id="recommended">Recommended:</h5>
<pre><code class="lang-css">    .nav &gt; li {
        ...
    }</code></pre>
<h3 id="nesting">Nesting</h3>
<p>Be careful with selectors nesting. In general try to use 3 nested levels as max.
Exception are pseudo elements and states</p>
<h5 id="not-recommended">Not recommended:</h5>
<pre><code class="lang-css">    .footer {
        ...
        .nav {
            ...
            .nav-list {
                ...
                .nav-list-item {
                    ...
                }
            }
        }
    }</code></pre>
<h5 id="recommended">Recommended:</h5>
<pre><code class="lang-css">    .footer {
        ...
        .nav {
            ...
        }
        .nav-list {
            ...
        }
        .nav-list-item {
            ...
         }
    }</code></pre>
<h2 id="properties">Properties</h2>
<h3 id="sort">Sort</h3>
<p>Sort all properties alphabetical. Mixins, variables etc. should go first</p>
<h5 id="not-recommended">Not recommended:</h5>
<pre><code class="lang-css">    .nav {
        color: @nav__color;
        text-align: center;
        background-color: @nav__background-color;
    }</code></pre>
<h5 id="recommended">Recommended:</h5>
<pre><code class="lang-css">    .nav {
        background-color: @nav__background-color;
        color: @nav__color;
        text-align: center;
    }</code></pre>
<h3 id="shorthand">Shorthand</h3>
<p>Use shortland properties where possible.</p>
<p>CSS offers a variety of shorthand properties (like font) that should be used whenever possible, even in cases where only one value is explicitly set.
Using shorthand properties is useful for code efficiency and understandability.</p>
<h5 id="not-recommended">Not recommended:</h5>
<pre><code class="lang-css">    border-top-style: none;
    padding-bottom: 2rem;
    padding-left: 1rem;
    padding-right: 1rem;
    padding-top: 0;</code></pre>
<h5 id="recommended">Recommended:</h5>
<pre><code class="lang-css">    border-top: 0;
    padding: 0 1em 2em;</code></pre>
<h3 id="0-and-units">0 and units</h3>
<p>Omit unit specification after &quot;0&quot; values.</p>
<h5 id="not-recommended">Not recommended:</h5>
<pre><code class="lang-css">    border-width: 0px;
    margin: 0rem;</code></pre>
<h5 id="recommended">Recommended:</h5>
<pre><code class="lang-css">    border-width: 0;
    margin: 0;</code></pre>
<h3 id="floating-values">Floating values</h3>
<p>Omit leading &quot;0&quot;s in values, use dot instead</p>
<h5 id="not-recommended">Not recommended:</h5>
<pre><code class="lang-css">    margin-left: 0.5rem;</code></pre>
<h5 id="recommended">Recommended:</h5>
<pre><code class="lang-css">    margin-left: .5rem;</code></pre>
<h3 id="hexadecimal-notation">Hexadecimal notation</h3>
<ul>
<li>Use lowercase only</li>
<li>Use 3 character hexadecimal notation where possible.</li>
<li>For color values that permit it, 3 character hexadecimal notation is shorter and more succinct.</li>
<li>Also please avoid hex color in properties, use only variables instead.</li>
</ul>
<h5 id="not-recommended">Not recommended:</h5>
<pre><code class="lang-css">    color: #ff0000;
    @nav__color: #FAFAFA;
    @nav-item__color: red;</code></pre>
<h5 id="recommended">Recommended:</h5>
<pre><code class="lang-css">    @nav__color: #fafafa;
    @nav-item__color: #f00;
    ...
    color: @nav-item__color;</code></pre>
<h2 id="variables">Variables</h2>
<h3 id="location">Location</h3>
<h4 id="local-variables">Local variables</h4>
<p>If variables are local and used only in module scope it should be located in module file, on the top of the file with general comment</p>
<p>Example <strong>_module.less</strong>:</p>
<pre><code class="lang-css">    ...

    //
    //  Variables
    //  _____________________________________________

    //  Colors
    @btn__color: @color-brownie;
    @btn-primary__color: @color-white;
    @btn-secondary__color: @color-white;
    ...</code></pre>
<h4 id="theme-variables">Theme variables</h4>
<p>If variables are common for couple modules it should be located in <strong>_theme.less</strong> file</p>
<h4 id="global-variables">Global variables</h4>
<p>If variables are common for couple themes it should be located in global lib in <strong>_variables.less</strong> file</p>
<h3 id="naming">Naming</h3>
<p>All variables should be written in lowercase.</p>
<h4 id="value-variables">Value variables</h4>
<h5 id="general-model-is">General model is:</h5>
<pre><code class="lang-css">    @property-name</code></pre>
<h5 id="examples">Examples:</h5>
<pre><code class="lang-css">    @primary__color: @color-phoenix;
    @indent__base: 2rem;
    @border-radius-round: 100%;</code></pre>
<h4 id="parameter-variables">Parameter variables</h4>
<h5 id="general-model-is">General model is:</h5>
<pre><code class="lang-css">    @component-element__state__property__modifier</code></pre>
<p>Please mention that component can be not only element name, it also can be primary, secondary, tertiary
Base is a modifier</p>
<h5 id="examples">Examples:</h5>
<pre><code class="lang-css">    @color-orange: &#39;&#39;;
    @link__hover__color: &#39;&#39;;
    @nav-element__background-color: &#39;&#39;;
    @secondary__color: &#39;&#39;;
    @side-nav__indent__s: &#39;&#39;;
    @side-nav-el__background-color: &#39;&#39;;
    @side-nav-el__active__background-color: &#39;&#39;;
    @side-nav-el__active-focus__background-color: &#39;&#39;;
    @side-nav-el__active-focus__font-size__xl: &#39;&#39;;
    @text__color__base: &#39;&#39;;</code></pre>
<h2 id="mixins">Mixins</h2>
<h3 id="location">Location</h3>
<p>Theme mixins (except extends) should be saved in <strong>source/utilities</strong> folder
Extends that used in more than one theme should be saved in lib <strong>lib/source/utilities.less</strong> (will be separated into utilities folder)</p>
<h3 id="naming">Naming</h3>
<p>In name creation you can follow the same rules as for the creation of class names.
For mixins grouping use prefix__</p>
<h5 id="example">Example:</h5>
<pre><code class="lang-css">    .extend__clearfix (...) {
        ...
    }

    .vendor-prefix__flex-direction (...) {
        ...
    }</code></pre>
<h2 id="extends">Extends</h2>
<h3 id="location">Location</h3>
<p>Local extends that used only in one file, should be written in this <strong>local file</strong>.
Extends that used in more than two files should be saved in theme <strong>source/_extend.less</strong>
Extends that used in more than one theme should be saved in lib <strong>lib/source/_abstract.less</strong> (will be renamed to _extend.less)</p>
<h3 id="naming">Naming</h3>
<p>Extend class names should have prefix <strong>.abs-</strong> (from abstract)</p>
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