1 files changed, 44 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/link-rel-attribute.html b/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/link-rel-attribute.html
new file mode 100644
index 0000000000..14d06227ac
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/link-rel-attribute.html
@@ -0,0 +1,44 @@
+<!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>