Primer ViewComponents v0.34.0

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<nav aria-label="Default with nav element" data-view-component="true" class="UnderlineNav">
  <ul data-view-component="true" class="UnderlineNav-body list-style-none">
    <li data-view-component="true" class="d-inline-flex">
      <a href="#" aria-current="page" data-view-component="true" class="UnderlineNav-item">
        Item 1
      </a></li>
    <li data-view-component="true" class="d-inline-flex">
      <a href="#" data-view-component="true" class="UnderlineNav-item">
        Item 2
      </a></li>
    <li data-view-component="true" class="d-inline-flex">
      <a href="#" data-view-component="true" class="UnderlineNav-item">
        Item 3
      </a></li>
  </ul>
  <div data-view-component="true" class="UnderlineNav-actions">      <button type="button" data-view-component="true" class="btn">    Button
    </button>
  </div>
</nav>
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<%= render(Primer::Alpha::UnderlineNav.new(label: label, tag: tag, align: align)) do |component| %>
  <% Array.new(number_of_panels || 3) do |i| %>
    <% component.with_tab(href: "#", selected: i.zero?) { "Item #{i + 1}" } %>
  <% end %>
  <% component.with_actions do %>
    <%= render(Primer::ButtonComponent.new) { "Button" } %>
  <% end %>
<% end %>

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app/components/primer/alpha/underline_nav.css

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/* UnderlineNav */
.UnderlineNav {
  display: flex;
  min-height: var(--base-size-48);
  overflow-x: auto;
  overflow-y: hidden;
  box-shadow: inset 0 -1px 0 var(--borderColor-muted);
  -webkit-overflow-scrolling: auto;
  justify-content: space-between;
}
.UnderlineNav .Counter {
    margin-left: var(--control-medium-gap);
    color: var(--fgColor-default);
    background-color: var(--bgColor-neutral-muted, var(--color-neutral-muted));
  }
.UnderlineNav .Counter--primary {
    color: var(--fgColor-onEmphasis);
    background-color: var(--bgColor-neutral-emphasis);
  }
.UnderlineNav-body {
  display: flex;
  align-items: center;
  gap: var(--control-medium-gap);
  list-style: none;
}
.UnderlineNav-item {
  position: relative;
  display: flex;
  padding: 0 var(--control-medium-paddingInline-condensed);
  font-size: var(--text-body-size-medium);
  line-height: 30px;
  color: var(--fgColor-default);
  text-align: center;
  white-space: nowrap;
  cursor: pointer;
  background-color: transparent;
  border: 0;
  border-radius: var(--borderRadius-medium);
  align-items: center;
}
.UnderlineNav-item:hover,.UnderlineNav-item:focus,.UnderlineNav-item:focus-visible {
    color: var(--fgColor-default);
    -webkit-text-decoration: none;
    text-decoration: none;
    border-bottom-color: var(--borderColor-neutral-muted);
    outline-offset: -2px;
    transition: border-bottom-color 0.12s ease-out;
  }
/* renders a visibly hidden "copy" of the label in bold, reserving box space for when label becomes bold on selected */
.UnderlineNav-item [data-content]::before {
    display: block;
    height: 0;
    font-weight: var(--base-text-weight-semibold);
    visibility: hidden;
    content: attr(data-content);
  }
/* increase touch target area */
:is(.UnderlineNav-item::before) {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 100%;
  min-height: 48px;
  content: "";
  transform: translateX(-50%) translateY(-50%);
}
/* hover state was "sticking" on mobile after click */
@media (pointer: fine) {
    .UnderlineNav-item:hover {
      color: var(--fgColor-default);
      -webkit-text-decoration: none;
      text-decoration: none;
      background: var(--control-transparent-bgColor-hover);
      transition: background 0.12s ease-out;
    }
  }
.UnderlineNav-item.selected,.UnderlineNav-item[role='tab'][aria-selected='true'],.UnderlineNav-item[aria-current]:not([aria-current='false']) {
    font-weight: var(--base-text-weight-semibold);
    color: var(--fgColor-default);
    border-bottom-color: var(--underlineNav-borderColor-active);
    /* current/selected underline */
  }
:is(.UnderlineNav-item.selected,.UnderlineNav-item[role='tab'][aria-selected='true'],.UnderlineNav-item[aria-current]:not([aria-current='false']))::after {
      position: absolute;
      z-index: 1; /* raise above full-width flash banner */
      right: 50%;
      bottom: calc(50% - 25px); /* 48px total height / 2 (24px) + 1px */
      width: 100%;
      height: 2px;
      content: '';
      background: var(--underlineNav-borderColor-active);
      border-radius: var(--borderRadius-medium);
      transform: translate(50%, -50%);
    }
.UnderlineNav--right {
  justify-content: flex-end;
}
.UnderlineNav--right .UnderlineNav-actions {
    flex: 1 1 auto;
  }
.UnderlineNav-actions {
  align-self: center;
}
.UnderlineNav--full {
  display: block;
  /* required for underline to align with additional wrapper element */
}
.UnderlineNav--full .UnderlineNav-body {
    min-height: var(--base-size-48);
  }
.UnderlineNav-octicon {
  display: inline !important;
  margin-right: var(--control-medium-gap);
  color: var(--fgColor-muted);
  fill: var(--fgColor-muted);
}
.UnderlineNav-container {
  display: flex;
  justify-content: space-between;
}