mutations.window.js

Enable keyboard shortcuts

This WPT test may be referenced by the following Test IDs:
- /html/semantics/document-metadata/the-style-element/mutations.window.html - WPT Dashboard Interop Dashboard

test(t => {

  const style = document.body.appendChild(document.createElement("style"));

  const sheet = style.sheet;

  t.add_cleanup(() => style.remove());

  assert_not_equals(sheet, null);

  style.appendChild(new Comment());

  assert_not_equals(sheet, style.sheet);

}, "Mutating the style element: inserting a Comment node");

test(t => {

  const style = document.body.appendChild(document.createElement("style"));

  t.add_cleanup(() => style.remove());

  const comment = style.appendChild(new Comment());

  const sheet = style.sheet;

  comment.appendData("x");

  assert_not_equals(sheet, style.sheet);

}, "Mutating the style element: mutating a Comment node");

test(t => {

  const style = document.body.appendChild(document.createElement("style"));

  t.add_cleanup(() => style.remove());

  const text1 = style.appendChild(new Text("1"));

  const text2 = style.appendChild(new Text("2"));

  assert_equals(style.textContent, "12");

  assert_equals(style.childNodes.length, 2);

  const sheet = style.sheet;

  style.normalize();

  assert_equals(style.childNodes.length, 1);

  assert_not_equals(sheet, style.sheet);

}, "Mutating the style element: using normalize()");

test(t => {

  const style = document.body.appendChild(document.createElement("style"));

  t.add_cleanup(() => style.remove());

  const comment = style.appendChild(new Comment());

  const sheet = style.sheet;

  comment.remove();

  assert_not_equals(sheet, style.sheet);

}, "Mutating the style element: removing a Comment node");

test(t => {

  const style = document.body.appendChild(document.createElement("style"));

  const sheet = style.sheet;

  t.add_cleanup(() => style.remove());

  assert_not_equals(sheet, null);

  style.appendChild(new DocumentFragment());

  assert_equals(sheet, style.sheet);

}, "Mutating the style element: inserting an empty DocumentFragment node");