adoptedstylesheets-modify-array-and-sheet.html

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This WPT test may be referenced by the following Test IDs:
- /css/cssom/adoptedstylesheets-modify-array-and-sheet.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>adoptedStyleSheet - Add and remove the same sheet with modifications</title>

<link rel="help" href="https://drafts.csswg.org/cssom/#extensions-to-the-document-or-shadow-root-interface">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<div id="target">This text should be green</div>

<script>

  const sheet_a = new CSSStyleSheet();

  sheet_a.replaceSync("#target { color: red; }");

  const sheet_b = new CSSStyleSheet();

  sheet_b.replaceSync("#target {}");

  test(() => {

    document.adoptedStyleSheets = [sheet_a, sheet_b];

    assert_equals(getComputedStyle(target).color, "rgb(255, 0, 0)");

  }, "Add the two sheets. Text should be red.");

  test(() => {

    document.adoptedStyleSheets[1] = sheet_a;

    document.adoptedStyleSheets[0] = sheet_b;

    assert_equals(getComputedStyle(target).color, "rgb(255, 0, 0)");

  }, "Flip the two sheet. Still red.");

  test(() => {

    sheet_a.cssRules[0].style.color = "green";

    assert_equals(getComputedStyle(target).color, "rgb(0, 128, 0)");

  }, "Modify the color declaration. Should now be green.");

</script>