<!DOCTYPE html>
<script src = "/resources/testharness.js"></script>
<script src = "/resources/testharnessreport.js"></script>

<link id="light-link" rel="stylesheet" href="resources/link-rel-attribute.css">
<div id="light-div" class="green">I"m green when light DOM link is on</div>

<div id="host">
  I"m green when Shadow DOM link is on
  <template id="shadow-dom">
    <link id="shadow-link" rel="stylesheet" href="resources/link-rel-attribute.css">
    <div id="shadow-div" class="green">
      <slot></slot>
    </div>
  </template>
</div>

<script>

function testLinkRelModification(testDiv, testLink) {
  assert_equals(getComputedStyle(testDiv).color, "rgb(0, 128, 0)");
  testLink.setAttribute("rel", "no-stylesheet");
  assert_equals(getComputedStyle(testDiv).color, "rgb(0, 0, 0)");
  testLink.setAttribute("rel", "stylesheet");
  assert_equals(getComputedStyle(testDiv).color, "rgb(0, 128, 0)");
  testLink.removeAttribute("rel");
  assert_equals(getComputedStyle(testDiv).color, "rgb(0, 0, 0)");
}

test (() => {
  testLinkRelModification(document.querySelector("#light-div"),
                          document.querySelector("#light-link"));
}, "Removing stylesheet from link rel attribute should remove the stylesheet for light DOM");

test (() => {
  var host = document.querySelector("#host");
  var shadow = host.attachShadow({ mode: "open" });
  var tmpl = document.querySelector("template#shadow-dom");
  var clone = document.importNode(tmpl.content, true);
  shadow.appendChild(clone);
  testLinkRelModification(shadow.querySelector("#shadow-div"),
                          shadow.querySelector("#shadow-link"));
}, "Removing stylesheet from link rel attribute should remove the stylesheet for shadow DOM");
</script>
