browser_rules_highlight-element-rule.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 rule view's highlightElementRule scrolls to the specified rule.

const TEST_URI = `

  <style type="text/css">

    .test::after {

      content: "!";

      color: red;

  </style>

  <div class="test">Hello</div>

`;

add_task(async function () {

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

  const { inspector, view } = await openRuleView();

  await selectNode(".test", inspector);

  const { rules, styleWindow } = view;

  info("Highlight .test::after rule.");

  const ruleId = rules[0].domRule.actorID;

  info("Wait for the view to scroll to the property.");

  const onHighlightProperty = view.once("scrolled-to-element");

  view.highlightElementRule(ruleId);

  await onHighlightProperty;

ok(

    isInViewport(rules[0].editor.element, styleWindow),

    ".test::after is in view."

);

});

function isInViewport(element, win) {

  const { top, left, bottom, right } = element.getBoundingClientRect();

  return (

    top >= 0 &&

    bottom <= win.innerHeight &&

    left >= 0 &&

    right <= win.innerWidth

);