1 files changed, 29 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/sizes/support/parse-a-sizes-attribute.js b/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/sizes/support/parse-a-sizes-attribute.js
new file mode 100644
index 0000000000..62ad00a468
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/sizes/support/parse-a-sizes-attribute.js
@@ -0,0 +1,29 @@
+setup({explicit_done:true});
+
+function check(p, iframe) {
+  var current = p.firstElementChild;
+  var ref_sizes = current.getAttribute('sizes');
+  var expect = current.currentSrc;
+  if (expect) {
+    expect = expect.split('?')[0];
+  }
+  while (current = current.nextElementSibling) {
+    test(function() {
+      if (expect === '' || expect === null || expect === undefined) {
+        assert_unreached('ref currentSrc was ' + format_value(expect));
+      }
+      var got = current.currentSrc;
+      assert_greater_than(got.indexOf('?'), -1, 'expected a "?" in currentSrc');
+      got = got.split('?')[0];
+      assert_equals(got, expect);
+    }, current.outerHTML + ' ref sizes=' + format_value(ref_sizes) + ' (' + iframe.getAttribute('data-desc') + ')');
+  }
+}
+
+onload = function() {
+  var iframe = document.querySelector('iframe');
+  [].forEach.call(iframe.contentDocument.querySelectorAll('p'), function(p) {
+    check(p, iframe);
+  });
+  done();
+}