1 files changed, 15 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/support/relevant-mutations.js b/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/support/relevant-mutations.js
new file mode 100644
index 0000000000..7105b03708
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/support/relevant-mutations.js
@@ -0,0 +1,15 @@
+setup({explicit_done:true});
+
+function t(desc, func, expect) {
+  async_test(function() {
+    var img = document.querySelector('[data-desc="' + desc + '"]');
+    img.onload = img.onerror = this.unreached_func('update the image data was run');
+    if (expect == 'timeout') {
+      setTimeout(this.step_func_done(), 1000);
+    } else {
+      img['on' + expect] = this.step_func_done();
+      setTimeout(this.unreached_func('update the image data didn\'t run'), 1000);
+    }
+    func.call(this, img);
+  }, desc);
+}