1 files changed, 27 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/document-metadata/interactions-of-styling-and-scripting/conditionally-block-rendering-on-link-media-attr.html b/testing/web-platform/tests/html/semantics/document-metadata/interactions-of-styling-and-scripting/conditionally-block-rendering-on-link-media-attr.html
new file mode 100644
index 0000000000..d21df46d30
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/document-metadata/interactions-of-styling-and-scripting/conditionally-block-rendering-on-link-media-attr.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src="support/utils.js"></script>
+
+<link rel=stylesheet href=stylesheet.py>
+<link rel=stylesheet media="screen and (max-width:10px)" href=stylesheet.py?stylesNotMatchingEnvironment&delay=2>
+<h1>Dominic Farolino</h1>
+<script>
+  test(() => {
+    const h1 = document.querySelector('h1');
+    const computedColor = getComputedStyle(h1).color;
+    const expectedColor = "rgb(128, 0, 128)";
+
+    assert_equals(computedColor, expectedColor);
+    assert_true(styleExists("h1 { color: purple; }")); // first style sheet
+    assert_false(styleExists("h1 { color: brown; }")); // second style sheet (should not be loaded yet)
+  }, "Only the style sheet loaded via a link element whose media attribute matches the environment should block following script execution");
+
+  const secondStylesheetTest = async_test("Both style sheets loaded via the link elements should be registered as style sheets for the document after 2 seconds");
+  secondStylesheetTest.step_timeout(() => {
+      assert_true(styleExists("h1 { color: purple; }")); // first style sheet
+      assert_true(styleExists("h1 { color: brown; }")); // second style sheet (loaded now!)
+      secondStylesheetTest.done();
+  }, 3000);
+</script>