browser_grids_grid-list-on-mutation-element-removed.js

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/* Any copyright is dedicated to the Public Domain.

 http://creativecommons.org/publicdomain/zero/1.0/ */

"use strict";

// Tests that the grid item is removed from the grid list when the grid container is

// removed from the page.

const TEST_URI = `

  <style type='text/css'>

    #grid {

      display: grid;

  </style>

  <div id="grid">

    <div id="cell1">cell1</div>

    <div id="cell2">cell2</div>

  </div>

`;

add_task(async function () {

  await addTab("data:text/html;charset=utf-8," + encodeURIComponent(TEST_URI));

  const { inspector, gridInspector } = await openLayoutView();

  const { document: doc } = gridInspector;

  const { highlighters, store } = inspector;

  await selectNode("#grid", inspector);

  const gridList = doc.getElementById("grid-list");

  const checkbox = gridList.children[0].querySelector("input");

  info("Checking the initial state of the Grid Inspector.");

  is(gridList.childNodes.length, 1, "One grid container is listed.");

  ok(!highlighters.gridHighlighters.size, "No CSS grid highlighter is shown.");

  info("Toggling ON the CSS grid highlighter from the layout panel.");

  const onHighlighterShown = highlighters.once("grid-highlighter-shown");

  let onCheckboxChange = waitUntilState(

    store,

    state => state.grids.length == 1 && state.grids[0].highlighted

);

  checkbox.click();

  await onHighlighterShown;

  await onCheckboxChange;

  info("Checking the CSS grid highlighter is created.");

  is(highlighters.gridHighlighters.size, 1, "CSS grid highlighter is shown.");

  info("Removing the #grid container in the content page.");

  const onHighlighterHidden = highlighters.once("grid-highlighter-hidden");

  onCheckboxChange = waitUntilState(store, state => !state.grids.length);

  SpecialPowers.spawn(gBrowser.selectedBrowser, [], () =>

    content.document.getElementById("grid").remove()

);

  await onHighlighterHidden;

  await onCheckboxChange;

  info("Checking the CSS grid highlighter is not shown.");

  ok(!highlighters.gridHighlighters.size, "No CSS grid highlighter is shown.");

  const noGridList = doc.querySelector(

    "#layout-grid-section .devtools-sidepanel-no-result"

);

  ok(noGridList, "The message no grid containers is displayed.");

});