Implement and document new grid helper

[geoffrey-eisenbarth]

Questions

• Should we still have separate "Flexbox" and "Grid" sections in the navbar? If not, where do we move the content to?

Possible impls

Blocked: @scope in Firefox. Update: no longer blocked
Blocked: attr() for <custom-ident> in Firefox (I think? mdn isn't clear on this): Update: still blocked: https://caniuse.com/mdn-css_types_attr_type_function_ident

Possible new syntax from @dz4k

<style>
.grid {
  [id] {
    grid-area: attr(id);
  }
}
</style>

<div class="grid" style="
  grid-template: if(
    media(width < 768px), 'title' 'nav' 'content',
    'title title' 'nav content' / auto 1fr
  )
">
  <h1 id=title>...</h1>
  <nav id=nav>...</nav>
  <div id=content>...</nav>

More suggestions from deniz:

.layout-grid {
  display: grid;
  gap: var(--gap);
  margin-block: var(--gap);

  @media (max-width: 768px) {
    display: flex;
    flex-flow: column nowrap;
  }
}

Usage:

<article class="layout-grid" style="grid: 1fr / 1fr 2fr">
<!-- or -->

<article class="layout-grid" style="
  grid-template:
  'image title' auto
  'image desc' 1fr
  /auto  1fr
">