1 files changed, 47 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/resources/link-style-error.js b/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/resources/link-style-error.js
new file mode 100644
index 0000000000..d1fa5ac2d6
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/resources/link-style-error.js
@@ -0,0 +1,47 @@
+["<link>", "@import"].forEach(linkType => {
+  [
+   ["same-origin", "resources/css.py"],
+   ["cross-origin", get_host_info().HTTP_REMOTE_ORIGIN + "/html/semantics/document-metadata/the-link-element/resources/css.py"]
+  ].forEach(originType => {
+    ["no Content-Type", "wrong Content-Type", "broken Content-Type"].forEach(contentType => {
+      ["no nosniff", "nosniff"].forEach(nosniff => {
+        async_test(t => {
+          const l = document.createElement("link");
+          t.add_cleanup(() => l.remove());
+          if (nosniff === "nosniff" || contentType === "wrong Content-Type" && (document.compatMode === "CSS1Compat" || originType[0] === "cross-origin")) {
+            l.onerror = t.step_func_done();
+            l.onload = t.unreached_func("error event should have fired");
+          } else {
+            l.onload = t.step_func_done();
+            l.onerror = t.unreached_func("load event should have fired");
+          }
+          l.rel = "stylesheet";
+          let query = [];
+          if (contentType === "broken Content-Type") {
+            query.push("content_type=oops");
+          } else if (contentType === "wrong Content-Type") {
+            query.push("content_type=text/plain")
+          }
+          if (nosniff === "nosniff") {
+            query.push("nosniff");
+          }
+          let stringQuery = "";
+          query.forEach(val => {
+            if (stringQuery === "") {
+              stringQuery += "?" + val;
+            } else {
+              stringQuery += "&" + val;
+            }
+          });
+          const link = new URL(originType[1] + stringQuery, location).href;
+          if (linkType === "<link>") {
+            l.href = link;
+          } else {
+            l.href = "data:text/css,@import url(" + link + ");";
+          }
+          document.head.appendChild(l);
+        }, "Stylesheet loading using " + linkType + " with " + contentType + ", " + originType[0] + ", and " + nosniff);
+      });
+    });
+  });
+});