Add test asserting the display property of <details> is ignored

Chrome, Safari, and Firefox pass. Edge hasn't implemented yet. The test still holds for the proposed new spec text in whatwg/html#3686 This scenario is discussed at the end of whatwg/html#603 but the conclusion drawn appears (to me) to be opposite what Chrome, Safari, and Firefox do. Related other issues: w3c/csswg-drafts#2084 whatwg/html#1839 Bug: 635282 Change-Id: Ice95225b3c9d5d90b80c657643d036490fd2e1b2
web-platform-tests · Aug 3, 2018 · e9f418f · e9f418f
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diff --git a/html/rendering/the-details-element/details-display-property-is-ignored-ref.html b/html/rendering/the-details-element/details-display-property-is-ignored-ref.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="author" title="David Grogan" href="[email protected]">
+From <a href="https://html.spec.whatwg.org/multipage/rendering.html#the-details-and-summary-elements">html.spec.whatwg.org</a>:
+
+<blockquote>
+The details element is expected to render as a block box. The element's shadow
+tree is expected to take the element's first summary element child, if any, and
+place it in a first block box container, and then take the element's remaining
+descendants, if any, and place them in a second block box container.
+</blockquote>
+
+&lt;details display:flex> should be ignored. Otherwise details would render as
+something other than a block box.
+
+<details open>
+  <summary>This is the summary.</summary>
+  <div>thing 1</div>
+  thing 2
+</details>
diff --git a/html/rendering/the-details-element/details-display-property-is-ignored.html b/html/rendering/the-details-element/details-display-property-is-ignored.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="author" title="David Grogan" href="[email protected]">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#the-details-and-summary-elements">
+<link rel="match" href="details-display-property-is-ignored-ref.html">
+<link rel="bookmark" href="https://bugs.chromium.org/p/chromium/issues/detail?id=635282" />
+<meta name="assert" content="The display property is ignored on details elements and is instead always rendered as a block box." />
+
+From <a href="https://html.spec.whatwg.org/multipage/rendering.html#the-details-and-summary-elements">html.spec.whatwg.org</a>:
+
+<blockquote>
+The details element is expected to render as a block box. The element's shadow
+tree is expected to take the element's first summary element child, if any, and
+place it in a first block box container, and then take the element's remaining
+descendants, if any, and place them in a second block box container.
+</blockquote>
+
+&lt;details display:flex> should be ignored. Otherwise details would render as
+something other than a block box.
+
+<details open style="display:flex;">
+  <summary>This is the summary.</summary>
+  <div>thing 1</div>
+  thing 2
+</details>