lang-attribute.window.js

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This WPT test may be referenced by the following Test IDs:
- /html/dom/elements/global-attributes/lang-attribute.window.html - WPT Dashboard Interop Dashboard

test(() => {

  const container = document.createElement("div");

  document.body.append(container);

  container.setAttribute("lang", "en-CA");

  const child = document.createElementNS("div", "test");

  container.append(child);

  child.setAttribute("lang", "en-NZ");

  assert_true(container.matches(":lang(en-CA)"), "container matches en-CA");

  assert_true(child.matches(":lang(en-CA)"), "child matches en-CA");

  assert_false(container.matches(":lang(en-NZ)"), "container does not match en-NZ");

  assert_false(child.matches(":lang(en-NZ)"), "child does not match en-NZ");

  container.remove();

}, "unnamespaced lang attribute only works on elements in the HTML namespace");