css/docs/content/components/navigation.md

title	path	status	source	bundle
Navigation	components/navigation	Stable	https://github.com/primer/css/tree/master/src/navigation	navigation

Primer CSS comes with several navigation components. Some were designed with singular purposes, while others were design to be more flexible and appear quite frequently.

Menu

The menu is a vertical list of navigational links. A menu's width and placement must be set by you. If you like, just use our grid columns as a parent. Otherwise, apply a custom width.

<nav class="menu" aria-label="Person settings">
  <a class="menu-item selected" href="#url" aria-current="page">Account</a>
  <a class="menu-item" href="#url">Profile</a>
  <a class="menu-item" href="#url">Emails</a>
  <a class="menu-item" href="#url">Notifications</a>
</nav>

There are a few subcomponents and add-ons that work well with the menu, including avatars, counters, and Octicons.

<nav class="menu" aria-label="Person settings">
  <a class="menu-item selected" href="#url" aria-current="page">
    <!-- <%= octicon "tools" %> -->
    <svg width="16" height="16" viewBox="0 0 16 16" class="octicon octicon-tools" aria-hidden="true">
      <path
        fill-rule="evenodd"
        d="M4.48 7.27c.26.26 1.28 1.33 1.28 1.33l.56-.58-.88-.91 1.69-1.8s-.76-.74-.43-.45c.32-1.19.03-2.51-.87-3.44C4.93.5 3.66.2 2.52.51l1.93 2-.51 1.96-1.89.52-1.93-2C-.19 4.17.1 5.48 1 6.4c.94.98 2.29 1.26 3.48.87zm6.44 1.94l-2.33 2.3 3.84 3.98c.31.33.73.49 1.14.49.41 0 .82-.16 1.14-.49.63-.65.63-1.7 0-2.35l-3.79-3.93zM16 2.53L13.55 0 6.33 7.46l.88.91-4.31 4.46-.99.53-1.39 2.27.35.37 2.2-1.44.51-1.02L7.9 9.08l.88.91L16 2.53z"
      />
    </svg>
    Account
  </a>
  <a class="menu-item" href="#url">
    <!-- <%= octicon "person" %> -->
    <svg width="12" height="16" viewBox="0 0 12 16" class="octicon octicon-person" aria-hidden="true">
      <path
        fill-rule="evenodd"
        d="M12 14.002a.998.998 0 0 1-.998.998H1.001A1 1 0 0 1 0 13.999V13c0-2.633 4-4 4-4s.229-.409 0-1c-.841-.62-.944-1.59-1-4 .173-2.413 1.867-3 3-3s2.827.586 3 3c-.056 2.41-.159 3.38-1 4-.229.59 0 1 0 1s4 1.367 4 4v1.002z"
      />
    </svg>
    Profile
  </a>
  <a class="menu-item" href="#url">
    <!-- <%= octicon "mail" %>-->
    <svg version="1.1" width="14" height="16" viewBox="0 0 14 16" class="octicon octicon-mail" aria-hidden="true">
      <path
        fill-rule="evenodd"
        d="M0 4v8c0 .55.45 1 1 1h12c.55 0 1-.45 1-1V4c0-.55-.45-1-1-1H1c-.55 0-1 .45-1 1zm13 0L7 9 1 4h12zM1 5.5l4 3-4 3v-6zM2 12l3.5-3L7 10.5 8.5 9l3.5 3H2zm11-.5l-4-3 4-3v6z"
      />
    </svg>
    Emails
  </a>
  <a class="menu-item" href="#url">
    <!-- <%= octicon "radio-tower" %> -->
    <svg
      version="1.1"
      width="16"
      height="16"
      viewBox="0 0 16 16"
      class="octicon octicon-radio-tower"
      aria-hidden="true"
    >
      <path
        fill-rule="evenodd"
        d="M4.79 6.11c.25-.25.25-.67 0-.92-.32-.33-.48-.76-.48-1.19 0-.43.16-.86.48-1.19.25-.26.25-.67 0-.92a.613.613 0 0 0-.45-.19c-.16 0-.33.06-.45.19-.57.58-.85 1.35-.85 2.11 0 .76.29 1.53.85 2.11.25.25.66.25.9 0zM2.33.52a.651.651 0 0 0-.92 0C.48 1.48.01 2.74.01 3.99c0 1.26.47 2.52 1.4 3.48.25.26.66.26.91 0s.25-.68 0-.94c-.68-.7-1.02-1.62-1.02-2.54 0-.92.34-1.84 1.02-2.54a.66.66 0 0 0 .01-.93zm5.69 5.1A1.62 1.62 0 1 0 6.4 4c-.01.89.72 1.62 1.62 1.62zM14.59.53a.628.628 0 0 0-.91 0c-.25.26-.25.68 0 .94.68.7 1.02 1.62 1.02 2.54 0 .92-.34 1.83-1.02 2.54-.25.26-.25.68 0 .94a.651.651 0 0 0 .92 0c.93-.96 1.4-2.22 1.4-3.48A5.048 5.048 0 0 0 14.59.53zM8.02 6.92c-.41 0-.83-.1-1.2-.3l-3.15 8.37h1.49l.86-1h4l.84 1h1.49L9.21 6.62c-.38.2-.78.3-1.19.3zm-.01.48L9.02 11h-2l.99-3.6zm-1.99 5.59l1-1h2l1 1h-4zm5.19-11.1c-.25.25-.25.67 0 .92.32.33.48.76.48 1.19 0 .43-.16.86-.48 1.19-.25.26-.25.67 0 .92a.63.63 0 0 0 .9 0c.57-.58.85-1.35.85-2.11 0-.76-.28-1.53-.85-2.11a.634.634 0 0 0-.9 0z"
      />
    </svg>
    <span class="Counter">3</span>
    Notifications
  </a>
</nav>

You can also add optional headings to a menu. Feel free to use nearly any semantic element with the .menu-heading class, including inline elements, headings, and more.

<nav class="menu" aria-labelledby="menu-heading">
  <span class="menu-heading" id="menu-heading">Menu heading</span>
  <a class="menu-item selected" href="#url" aria-current="page">Account</a>
  <a class="menu-item" href="#url">Profile</a>
  <a class="menu-item" href="#url">Emails</a>
  <a class="menu-item" href="#url">Notifications</a>
</nav>

Underline nav

Use .UnderlineNav to style navigation with a minimal underlined selected state, typically used for navigation placed at the top of the page. This component comes with variations to accommodate icons, containers and other content.

<nav class="UnderlineNav">
  <div class="UnderlineNav-body">
    <a href="#url" role="tab" title="Item 1" class="UnderlineNav-item selected">Item 1</a>
    <a href="#url" role="tab" title="Item 2" class="UnderlineNav-item">Item 2</a>
    <a href="#url" role="tab" title="Item 3" class="UnderlineNav-item">Item 3</a>
    <a href="#url" role="tab" title="Item 4" class="UnderlineNav-item">Item 4</a>
  </div>
</nav>

Use .UnderlineNav-actions to place another element, such as a button, to the opposite side of the navigation items.

<nav class="UnderlineNav" aria-label="Foo bar">
  <div class="UnderlineNav-body">
    <a href="#url" class="UnderlineNav-item selected">Item 1</a>
    <a href="#url" class="UnderlineNav-item">Item 2</a>
    <a href="#url" class="UnderlineNav-item">Item 3</a>
    <a href="#url" class="UnderlineNav-item">Item 4</a>
  </div>
  <div class="UnderlineNav-actions">
    <a class="btn">Button</a>
  </div>
</nav>

Use .UnderlineNav--right to right align the navigation.

<nav class="UnderlineNav UnderlineNav--right">
  <div class="UnderlineNav-body">
    <a href="#url" role="tab" title="Item 1" class="UnderlineNav-item selected">Item 1</a>
    <a href="#url" role="tab" title="Item 2" class="UnderlineNav-item">Item 2</a>
    <a href="#url" role="tab" title="Item 3" class="UnderlineNav-item">Item 3</a>
    <a href="#url" role="tab" title="Item 4" class="UnderlineNav-item">Item 4</a>
  </div>
</nav>

.UnderlineNav--right also works with when used with .UnderlineNav-actions.

<nav class="UnderlineNav UnderlineNav--right" aria-label="Foo bar">
  <div class="UnderlineNav-actions">
    <a class="btn">Button</a>
  </div>
  <div class="UnderlineNav-body">
    <a href="#url" class="UnderlineNav-item selected">Item 1</a>
    <a href="#url" class="UnderlineNav-item">Item 2</a>
    <a href="#url" class="UnderlineNav-item">Item 3</a>
    <a href="#url" class="UnderlineNav-item">Item 4</a>
  </div>
</nav>

.Counters and .octicons can be used with navigation items. Use .UnderlineNav-octicon to add color and hover styles.

<nav class="UnderlineNav" aria-label="Foo bar">
  <div class="UnderlineNav-body">
    <a href="#url" class="UnderlineNav-item selected">
      <!-- <%= octicon "tools", :class = "UnderlineNav-octicon" %> -->
      <svg
        version="1.1"
        width="16"
        height="16"
        viewBox="0 0 16 16"
        class="octicon octicon-tools UnderlineNav-octicon"
        aria-hidden="true"
      >
        <path
          fill-rule="evenodd"
          d="M4.48 7.27c.26.26 1.28 1.33 1.28 1.33l.56-.58-.88-.91 1.69-1.8s-.76-.74-.43-.45c.32-1.19.03-2.51-.87-3.44C4.93.5 3.66.2 2.52.51l1.93 2-.51 1.96-1.89.52-1.93-2C-.19 4.17.1 5.48 1 6.4c.94.98 2.29 1.26 3.48.87zm6.44 1.94l-2.33 2.3 3.84 3.98c.31.33.73.49 1.14.49.41 0 .82-.16 1.14-.49.63-.65.63-1.7 0-2.35l-3.79-3.93zM16 2.53L13.55 0 6.33 7.46l.88.91-4.31 4.46-.99.53-1.39 2.27.35.37 2.2-1.44.51-1.02L7.9 9.08l.88.91L16 2.53z"
        />
      </svg>
      Item 1
    </a>
    <a href="#url" class="UnderlineNav-item">
      <!-- <%= octicon "tools", :class = "UnderlineNav-octicon" %> -->
      <svg
        version="1.1"
        width="16"
        height="16"
        viewBox="0 0 16 16"
        class="octicon octicon-tools UnderlineNav-octicon"
        aria-hidden="true"
      >
        <path
          fill-rule="evenodd"
          d="M4.48 7.27c.26.26 1.28 1.33 1.28 1.33l.56-.58-.88-.91 1.69-1.8s-.76-.74-.43-.45c.32-1.19.03-2.51-.87-3.44C4.93.5 3.66.2 2.52.51l1.93 2-.51 1.96-1.89.52-1.93-2C-.19 4.17.1 5.48 1 6.4c.94.98 2.29 1.26 3.48.87zm6.44 1.94l-2.33 2.3 3.84 3.98c.31.33.73.49 1.14.49.41 0 .82-.16 1.14-.49.63-.65.63-1.7 0-2.35l-3.79-3.93zM16 2.53L13.55 0 6.33 7.46l.88.91-4.31 4.46-.99.53-1.39 2.27.35.37 2.2-1.44.51-1.02L7.9 9.08l.88.91L16 2.53z"
        />
      </svg>
      Item 2
      <span class="Counter">10</span>
    </a>
    <a href="#url" class="UnderlineNav-item">
      <!-- <%= octicon "tools", :class = "UnderlineNav-octicon" %> -->
      <svg
        version="1.1"
        width="16"
        height="16"
        viewBox="0 0 16 16"
        class="octicon octicon-tools UnderlineNav-octicon"
        aria-hidden="true"
      >
        <path
          fill-rule="evenodd"
          d="M4.48 7.27c.26.26 1.28 1.33 1.28 1.33l.56-.58-.88-.91 1.69-1.8s-.76-.74-.43-.45c.32-1.19.03-2.51-.87-3.44C4.93.5 3.66.2 2.52.51l1.93 2-.51 1.96-1.89.52-1.93-2C-.19 4.17.1 5.48 1 6.4c.94.98 2.29 1.26 3.48.87zm6.44 1.94l-2.33 2.3 3.84 3.98c.31.33.73.49 1.14.49.41 0 .82-.16 1.14-.49.63-.65.63-1.7 0-2.35l-3.79-3.93zM16 2.53L13.55 0 6.33 7.46l.88.91-4.31 4.46-.99.53-1.39 2.27.35.37 2.2-1.44.51-1.02L7.9 9.08l.88.91L16 2.53z"
        />
      </svg>
      Item 3
    </a>
    <a href="#url" class="UnderlineNav-item">
      <!-- <%= octicon "tools", :class = "UnderlineNav-octicon" %> -->
      <svg
        version="1.1"
        width="16"
        height="16"
        viewBox="0 0 16 16"
        class="octicon octicon-tools UnderlineNav-octicon"
        aria-hidden="true"
      >
        <path
          fill-rule="evenodd"
          d="M4.48 7.27c.26.26 1.28 1.33 1.28 1.33l.56-.58-.88-.91 1.69-1.8s-.76-.74-.43-.45c.32-1.19.03-2.51-.87-3.44C4.93.5 3.66.2 2.52.51l1.93 2-.51 1.96-1.89.52-1.93-2C-.19 4.17.1 5.48 1 6.4c.94.98 2.29 1.26 3.48.87zm6.44 1.94l-2.33 2.3 3.84 3.98c.31.33.73.49 1.14.49.41 0 .82-.16 1.14-.49.63-.65.63-1.7 0-2.35l-3.79-3.93zM16 2.53L13.55 0 6.33 7.46l.88.91-4.31 4.46-.99.53-1.39 2.27.35.37 2.2-1.44.51-1.02L7.9 9.08l.88.91L16 2.53z"
        />
      </svg>
      Item 4
    </a>
  </div>
</nav>

Use .UnderlineNav--full in combination with container styles and .UnderlineNav-container to make navigation fill the width of the container.

<nav class="UnderlineNav UnderlineNav--full" aria-label="Foo bar">
  <div class="container-lg UnderlineNav-container">
    <div class="UnderlineNav-body">
      <a href="#url" class="UnderlineNav-item selected">Item 1</a>
      <a href="#url" class="UnderlineNav-item"
        >Item 2
        <span class="Counter">10</span>
      </a>
      <a href="#url" class="UnderlineNav-item">Item 3</a>
      <a href="#url" class="UnderlineNav-item">Item 4</a>
    </div>
    <div class="UnderlineNav-actions">
      <a class="btn">Button</a>
    </div>
  </div>
</nav>

Side Nav

The Side Nav is a vertical list of navigational links, typically used on the left side of a page. For maximum flexibility, Side Nav elements have no default width or positioning. We suggest using column grid classes or an inline width style for sizing, and flexbox utilities for positioning alongside content.

• You can use a light gray background and a border if the parent element doesn't have it already.
• Add aria-current="page" to show a link as selected. Selected button elements in tab-like UIs should instead have aria-selected="true".

<nav class="SideNav bg-gray-light border" style="max-width: 360px">
  <a class="SideNav-item" href="#url">Account</a>
  <a class="SideNav-item" href="#url" aria-current="page">Profile</a>
  <a class="SideNav-item" href="#url">Emails</a>
  <a class="SideNav-item" href="#url">Notifications</a>
</nav>

Different kind of content can be added inside a Side Nav item. Use utility classes to further style them if needed.

<nav class="SideNav bg-gray-light border" style="max-width: 360px">
  <a class="SideNav-item" href="#url">
    Text only
  </a>
  <a class="SideNav-item" href="#url">
    <img
      class="avatar avatar-small mr-2"
      src="https://avatars.githubusercontent.com/hubot?s=40"
      alt="hubot"
      height="20"
      width="20"
    />
    With an avatar
  </a>
  <a class="SideNav-item" href="#url">
    <!-- <%= octicon "octoface", class: "mr-2" %> -->
    <svg
      version="1.1"
      width="16"
      height="16"
      viewBox="0 0 16 16"
      class="octicon octicon-octoface mr-2"
      aria-hidden="true"
    >
      <path
        fill-rule="evenodd"
        d="M14.7 5.34c.13-.32.55-1.59-.13-3.31 0 0-1.05-.33-3.44 1.3-1-.28-2.07-.32-3.13-.32s-2.13.04-3.13.32c-2.39-1.64-3.44-1.3-3.44-1.3-.68 1.72-.26 2.99-.13 3.31C.49 6.21 0 7.33 0 8.69 0 13.84 3.33 15 7.98 15S16 13.84 16 8.69c0-1.36-.49-2.48-1.3-3.35zM8 14.02c-3.3 0-5.98-.15-5.98-3.35 0-.76.38-1.48 1.02-2.07 1.07-.98 2.9-.46 4.96-.46 2.07 0 3.88-.52 4.96.46.65.59 1.02 1.3 1.02 2.07 0 3.19-2.68 3.35-5.98 3.35zM5.49 9.01c-.66 0-1.2.8-1.2 1.78s.54 1.79 1.2 1.79c.66 0 1.2-.8 1.2-1.79s-.54-1.78-1.2-1.78zm5.02 0c-.66 0-1.2.79-1.2 1.78s.54 1.79 1.2 1.79c.66 0 1.2-.8 1.2-1.79s-.53-1.78-1.2-1.78z"
      />
    </svg>
    With an icon
  </a>
  <a class="SideNav-item d-flex flex-items-center flex-justify-between" href="#url">
    With a status icon
    <!-- <%= octicon "primitive-dot", class: "color-green-5 ml-2 float-right" %> -->
    <svg
      version="1.1"
      width="8"
      height="16"
      viewBox="0 0 8 16"
      class="octicon octicon-primitive-dot color-green-5 ml-2 float-right"
      aria-hidden="true"
    >
      <path fill-rule="evenodd" d="M0 8c0-2.2 1.8-4 4-4s4 1.8 4 4-1.8 4-4 4-4-1.8-4-4z" />
    </svg>
  </a>
  <a class="SideNav-item d-flex flex-items-center flex-justify-between" href="#url">
    With a label <span class="Label bg-blue" title="Label: label">label</span>
  </a>
  <a class="SideNav-item d-flex flex-items-center flex-justify-between" href="#url">
    With a counter <span class="Counter bg-gray-2 ml-1">16</span>
  </a>
  <a class="SideNav-item" href="#url">
    <h5>With a heading</h5>
    <span>and some longer description</span>
  </a>
</nav>

The .SideNav-subItem is an alternative, more lightweight version without borders and more condensed. It can be used stand-alone.

<aside class="bg-gray-light border p-3" style="max-width: 360px">
  <h5 class="text-gray mb-2 pb-1 border-bottom">Menu</h5>
  <nav class="SideNav">
    <a class="SideNav-subItem" href="#url">Account</a>
    <a class="SideNav-subItem" href="#url" aria-current="page">Profile</a>
    <a class="SideNav-subItem" href="#url">Emails</a>
    <a class="SideNav-subItem" href="#url">Notifications</a>
  </nav>
  <aside></aside>
</aside>

Or also appear nested, as a sub navigation. Use margin/padding utility classes to add indentation.

<nav class="SideNav bg-gray-light border" style="max-width: 360px">
  <a class="SideNav-item" href="#url">
    <!-- <%= octicon "person", class: "mr-2" %> -->
    <svg width="12" height="16" viewBox="0 0 12 16" class="octicon octicon-person mr-2" aria-hidden="true">
      <path
        fill-rule="evenodd"
        d="M12 14.002a.998.998 0 0 1-.998.998H1.001A1 1 0 0 1 0 13.999V13c0-2.633 4-4 4-4s.229-.409 0-1c-.841-.62-.944-1.59-1-4 .173-2.413 1.867-3 3-3s2.827.586 3 3c-.056 2.41-.159 3.38-1 4-.229.59 0 1 0 1s4 1.367 4 4v1.002z"
      />
    </svg>
    <span>Account</span>
  </a>
  <a class="SideNav-item" href="#url" aria-current="page">
    <!-- <%= octicon "octoface", class: "mr-2" %> -->
    <svg width="16" height="16" viewBox="0 0 16 16" class="octicon octicon-octoface mr-2" aria-hidden="true">
      <path
        fill-rule="evenodd"
        d="M14.7 5.34c.13-.32.55-1.59-.13-3.31 0 0-1.05-.33-3.44 1.3-1-.28-2.07-.32-3.13-.32s-2.13.04-3.13.32c-2.39-1.64-3.44-1.3-3.44-1.3-.68 1.72-.26 2.99-.13 3.31C.49 6.21 0 7.33 0 8.69 0 13.84 3.33 15 7.98 15S16 13.84 16 8.69c0-1.36-.49-2.48-1.3-3.35zM8 14.02c-3.3 0-5.98-.15-5.98-3.35 0-.76.38-1.48 1.02-2.07 1.07-.98 2.9-.46 4.96-.46 2.07 0 3.88-.52 4.96.46.65.59 1.02 1.3 1.02 2.07 0 3.19-2.68 3.35-5.98 3.35zM5.49 9.01c-.66 0-1.2.8-1.2 1.78s.54 1.79 1.2 1.79c.66 0 1.2-.8 1.2-1.79s-.54-1.78-1.2-1.78zm5.02 0c-.66 0-1.2.79-1.2 1.78s.54 1.79 1.2 1.79c.66 0 1.2-.8 1.2-1.79s-.53-1.78-1.2-1.78z"
      />
    </svg>
    <span>Profile</span>
  </a>
  <nav class="SideNav bg-white border-top py-3 pl-6">
    <a class="SideNav-subItem" href="#url" aria-current="page">Sub item 1</a>
    <a class="SideNav-subItem" href="#url">Sub item 2</a>
    <a class="SideNav-subItem" href="#url">Sub item 3</a>
  </nav>
  <a class="SideNav-item" href="#url">
    <!-- <%= octicon "mail", class: "mr-2" %> -->
    <svg width="14" height="16" viewBox="0 0 14 16" class="octicon octicon-mail mr-2" aria-hidden="true">
      <path
        fill-rule="evenodd"
        d="M0 4v8c0 .55.45 1 1 1h12c.55 0 1-.45 1-1V4c0-.55-.45-1-1-1H1c-.55 0-1 .45-1 1zm13 0L7 9 1 4h12zM1 5.5l4 3-4 3v-6zM2 12l3.5-3L7 10.5 8.5 9l3.5 3H2zm11-.5l-4-3 4-3v6z"
      />
    </svg>
    <span>Emails</span>
  </a>
</nav>

Tabnav

When you need to toggle between different views, consider using a tabnav. It'll give you a left-aligned horizontal row of... tabs!

<div class="tabnav">
  <nav class="tabnav-tabs" aria-label="Foo bar">
    <a href="#url" class="tabnav-tab selected" aria-current="page">Foo tab</a>
    <a href="#url" class="tabnav-tab">Bar tab</a>
  </nav>
</div>

Use .float-right to align additional elements in the .tabnav:

<div class="tabnav">
  <a class="btn btn-sm float-right" href="#url" role="button">Button</a>
  <nav class="tabnav-tabs" aria-label="Foo bar">
    <a href="#url" class="tabnav-tab selected" aria-current="page">Foo Tab</a>
    <a href="#url" class="tabnav-tab">Bar Tab</a>
  </nav>
</div>

Additional bits of text and links can be styled for optimal placement with .tabnav-extra:

<div class="tabnav">
  <div class="tabnav-extra float-right">
    Tabnav widget text here.
  </div>
  <nav class="tabnav-tabs" aria-label="Foo bar">
    <a href="#url" class="tabnav-tab selected" aria-current="page">Foo Tab</a>
    <a href="#url" class="tabnav-tab">Bar Tab</a>
  </nav>
</div>

<div class="tabnav">
  <div class="float-right">
    <a class="tabnav-extra" href="#url">
      Tabnav extra link
    </a>
    <a class="tabnav-extra" href="#url">
      Tabnav extra link
    </a>
  </div>
  <nav class="tabnav-tabs" aria-label="Foo bar">
    <a href="#url" class="tabnav-tab selected" aria-current="page">Foo Tab</a>
    <a href="#url" class="tabnav-tab">Bar Tab</a>
  </nav>
</div>

Filter list

A vertical list of filters. Grey text on white background. Selecting a filter from the list will fill its background with blue and make the text white.

<ul class="filter-list">
  <li>
    <a href="#url" class="filter-item selected" aria-current="page">
      <span class="count" title="results">21</span>
      First filter
    </a>
  </li>
  <li>
    <a href="#url" class="filter-item">
      <span class="count" title="results">3</span>
      Second filter
    </a>
  </li>
  <li>
    <a href="#url" class="filter-item">
      Third filter
    </a>
  </li>
</ul>

Sub navigation

.subnav is navigation that is typically used when on a dashboard type interface with another set of navigation above it. This helps distinguish navigation hierarchy.

<nav class="subnav" aria-label="Respository">
  <a href="#url" class="subnav-item selected" aria-current="page">Item 1</a>
  <a href="#url" class="subnav-item">Item 2</a>
  <a href="#url" class="subnav-item">Item 3</a>
</nav>

You can have subnav-search in the subnav bar.

<div class="subnav">
  <nav class="subnav-links" aria-label="Repository">
    <a href="#url" class="subnav-item selected" aria-current="page">Item 1</a>
    <a href="#url" class="subnav-item">Item 2</a>
    <a href="#url" class="subnav-item">Item 3</a>
  </nav>
  <div class="subnav-search float-left">
    <input type="search" name="name" class="form-control subnav-search-input" value="" aria-label="Search site" />
    <!-- <%= octicon "search", :class = "subnav-search-icon" %> -->
    <svg
      width="16"
      height="16"
      viewBox="0 0 16 16"
      class="octicon octicon-search subnav-search-icon"
      aria-hidden="true"
    >
      <path
        fill-rule="evenodd"
        d="M15.7 13.3l-3.81-3.83A5.93 5.93 0 0 0 13 6c0-3.31-2.69-6-6-6S1 2.69 1 6s2.69 6 6 6c1.3 0 2.48-.41 3.47-1.11l3.83 3.81c.19.2.45.3.7.3.25 0 .52-.09.7-.3a.996.996 0 0 0 0-1.41v.01zM7 10.7c-2.59 0-4.7-2.11-4.7-4.7 0-2.59 2.11-4.7 4.7-4.7 2.59 0 4.7 2.11 4.7 4.7 0 2.59-2.11 4.7-4.7 4.7z"
      />
    </svg>
  </div>
</div>

You can also use a subnav-search-context to display search help in a select menu.

<div class="subnav">
  <nav class="subnav-links">
    <a href="#url" class="subnav-item selected">Item 1</a>
    <a href="#url" class="subnav-item">Item 2</a>
    <a href="#url" class="subnav-item">Item 3</a>
  </nav>
  <div class="float-left ml-3 select-menu js-menu-container js-select-menu subnav-search-context">
    <button
      type="button"
      name="button"
      class="btn select-menu-button js-menu-target"
      aria-expanded="false"
      aria-haspopup="true"
    >
      Filters
    </button>
    <div class="select-menu-modal-holder js-menu-content js-navigation-container" aria-hidden="true">
      <div class="select-menu-modal">
        <div class="select-menu-list">
          <a href="#url" class="select-menu-item js-navigation-item">
            <div class="select-menu-item-text">
              Search filter 1
            </div>
          </a>
          <a href="#url" class="select-menu-item js-navigation-item">
            <div class="select-menu-item-text">
              Search filter 2
            </div>
          </a>
          <a href="#url" class="select-menu-item js-navigation-item">
            <div class="select-menu-item-text">
              Search filter 3
            </div>
          </a>
        </div>
      </div>
    </div>
  </div>
  <div class="subnav-search float-left">
    <input type="search" name="name" class="form-control subnav-search-input" value="" aria-label="Search site" />
    <!-- <%= octicon "search", :class = "subnav-search-icon" %> -->
    <svg
      width="16"
      height="16"
      viewBox="0 0 16 16"
      class="octicon octicon-search subnav-search-icon"
      aria-hidden="true"
    >
      <path
        fill-rule="evenodd"
        d="M15.7 13.3l-3.81-3.83A5.93 5.93 0 0 0 13 6c0-3.31-2.69-6-6-6S1 2.69 1 6s2.69 6 6 6c1.3 0 2.48-.41 3.47-1.11l3.83 3.81c.19.2.45.3.7.3.25 0 .52-.09.7-.3a.996.996 0 0 0 0-1.41v.01zM7 10.7c-2.59 0-4.7-2.11-4.7-4.7 0-2.59 2.11-4.7 4.7-4.7 2.59 0 4.7 2.11 4.7 4.7 0 2.59-2.11 4.7-4.7 4.7z"
      />
    </svg>
  </div>
</div>