1 files changed, 61 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/rendering/widgets/button-layout/flex.html b/testing/web-platform/tests/html/rendering/widgets/button-layout/flex.html
new file mode 100644
index 0000000000..7f159fc232
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+++ b/testing/web-platform/tests/html/rendering/widgets/button-layout/flex.html
@@ -0,0 +1,61 @@
+<!doctype html>
+<title>button with flex/inline-flex</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<style>
+#inline-flex { display: inline-flex }
+#flex { display: flex }
+#ref > div { display: flex }
+
+#flexstart {
+  border: none;
+  padding: 0;
+  display: flex;
+  align-items: flex-start;
+  height: 3em;
+}
+
+#stretch {
+  border: none;
+  padding: 0;
+  display: flex;
+  align-items: stretch;
+  height: 3em;
+}
+</style>
+<button id=inline-flex><div>1</div><div>2</div><div>3</div><div>4</div></button>
+<button id=flex><div>1</div><div>2</div><div>3</div><div>4</div></button>
+<button id=ref><div><div>1</div><div>2</div><div>3</div><div>4</div></div></button>
+
+<div><button id="flexstart"><span id="flexstart-item">abc</span></button></div>
+
+<div><button id="stretch"><span id="stretch-item">abc</span></button></div>
+<script>
+const ref = document.getElementById('ref');
+const expectedWidth = ref.clientWidth;
+const expectedHeight = ref.clientHeight;
+for (const elm of [document.getElementById('inline-flex'),
+                   document.getElementById('flex')]) {
+  test(() => {
+    // check that flex is supported
+    const flexValue = elm.id;
+    assert_equals(getComputedStyle(elm).display, flexValue, `${flexValue} is not supported`);
+    const width = elm.clientWidth;
+    const height = elm.clientHeight;
+    assert_equals(width, expectedWidth, 'clientWidth');
+    assert_equals(height, expectedHeight, 'clientHeight');
+  }, elm.id);
+}
+
+// crbug.com/700029
+test(() => {
+  assert_equals(document.getElementById('flexstart').offsetTop,
+    document.getElementById('flexstart-item').offsetTop);
+}, 'align-items:flex-start should work');
+
+// crbug.com/1004163
+test(() => {
+  assert_equals(document.getElementById('stretch').offsetHeight,
+    document.getElementById('stretch-item').offsetHeight);
+}, 'align-items:stretch should work');
+</script>