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+++ b/testing/web-platform/tests/html/dom/render-blocking/blocking-idl-attr.tentative.html
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+<!DOCTYPE html>
+<title>Tests the 'blocking' IDL attribute on link, script and style elements</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+// Tests that the 'blocking' attribute follows the IDL:
+// [SameObject, PutForwards=value] readonly attribute DOMTokenList blocking;
+
+test(() => {
+  const link = document.createElement('link');
+  assert_true(link.blocking.supports('render'));
+  assert_false(link.blocking.supports('asdf'));
+}, "Supported tokens of the 'blocking' IDL attribute of the link element");
+
+test(() => {
+  const link = document.createElement('link');
+  link.blocking = 'asdf';
+  assert_equals(link.blocking.value, 'asdf');
+}, "Setting the 'blocking' IDL attribute of the link element");
+
+test(() => {
+  const script = document.createElement('script');
+  assert_true(script.blocking.supports('render'));
+  assert_false(script.blocking.supports('asdf'));
+}, "Supported tokens of the 'blocking' IDL attribute of the script element");
+
+test(() => {
+  const script = document.createElement('script');
+  script.blocking = 'asdf';
+  assert_equals(script.blocking.value, 'asdf');
+}, "Setting the 'blocking' IDL attribute of the script element");
+
+test(() => {
+  const style = document.createElement('style');
+  assert_true(style.blocking.supports('render'));
+  assert_false(style.blocking.supports('asdf'));
+}, "Supported tokens of the 'blocking' IDL attribute of the style element");
+
+test(() => {
+  const style = document.createElement('style');
+  style.blocking = 'asdf';
+  assert_equals(style.blocking.value, 'asdf');
+}, "Setting the 'blocking' IDL attribute of the style element");
+</script>