wpt/css/css-display/display-contents-blockify-dynamic.html at master · web-platform-tests/wpt · GitHub

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<!doctype html>
<link rel="help" href="https://un5h208565ak8emkwgjjkgb49yug.julianrbryant.com/show_bug.cgi?id=1561283">
<link rel="help" href="https://un5n798jx6qx6j0rmf2verhh.julianrbryant.com/css-display/#valdef-display-contents">
<link rel="help" href="https://un5n798jx6qx6j0rmf2verhh.julianrbryant.com/css-grid/#grid-item-display">
<link rel="author" href="https://un5pc8f538pd6zm5.julianrbryant.com" title="Mozilla">
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<link rel="author" href="mailto:obrufau@igalia.com" title="Oriol Brufau">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  .grid { display: grid }
</style>
<div style="display: grid">
  <span id="grid-child">
    <span></span>
  </div>
</div>
<div id="grid-to-block" style="display: grid">
  <div style="display: contents">
    <div style="display: contents">
      <button>button1</button>
      <button id="deblockified">button2</button>
    </div>
  </div>
</div>
<div id="block-to-grid" style="display: block">
  <div style="display: contents">
    <div style="display: contents">
      <button>button1</button>
      <button id="blockified">button2</button>
    </div>
  </div>
</div>
<script>
function display(el) {
  return getComputedStyle(el).display;
}
test(function() {
  let child = document.getElementById("grid-child");
  let grandChild = child.firstElementChild;
  assert_equals(display(child), "block", "Grid child should get blockified");
  assert_equals(display(grandChild), "inline", "Grid grand-child should not get initially blockified");
  child.style.display = "contents";
  assert_equals(display(child), "contents", "No reason for it not to become display: contents");
  assert_equals(display(grandChild), "block", "Grid grand-child with display: contents parent should get blockified");
  child.style.display = "";
  assert_equals(display(child), "block", "Grid child should get blockified");
  assert_equals(display(grandChild), "inline", "Grid grand-child should get un-blockified when its parent's display stops being `contents`");
}, "Dynamic changes to `display` causing blockification of children are handled correctly");

test(() => {
  let gridToBlock = document.getElementById("grid-to-block");
  let itemGrandChild = document.getElementById("deblockified");

  assert_equals(display(gridToBlock), "grid", "Container should be a grid");
  assert_equals(display(itemGrandChild), "block", "Item should have been blockified");
  gridToBlock.style.display = "block";
  assert_equals(display(gridToBlock), "block", "Container should become a block");
  assert_equals(display(itemGrandChild), "inline-block", "Item should get de-blockified");
}, "Dynamic changes to `display` from `grid` to `block` should cause children to get de-blockified despite being children of `display: contents` elements");

test(() => {
  let blockToGrid = document.getElementById("block-to-grid");
  let itemGrandChild = document.getElementById("blockified");

  assert_equals(display(blockToGrid), "block", "Container should be a block");
  assert_equals(display(itemGrandChild), "inline-block", "Item should not have been blockified");
  blockToGrid.style.display = "grid";
  assert_equals(display(blockToGrid), "grid", "Container should become a grid");
  assert_equals(display(itemGrandChild), "block", "Item should get blockified");
}, "Dynamic changes to `display` from `block` to `grid` should cause children to get blockified despite being children of `display: contents` elements")
</script>