Restore old behavior for background-size: cover + zero-height backgro…

…und positioning area. This restores our previous behavior and adds a .tentative test because I couldn't see how the spec makes any sense. Filed w3c/csswg-drafts#4049 about that. Differential Revision: https://phabricator.services.mozilla.com/D35571 bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1559094 gecko-commit: 7ae44e68ef103e451b5a535b4f77407c0ae78382 gecko-integration-branch: central gecko-reviewers: dholbert
web-platform-tests · Jul 23, 2019 · c745afc · c745afc
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diff --git a/css/css-backgrounds/background-size-cover-003-ref.html b/css/css-backgrounds/background-size-cover-003-ref.html
@@ -0,0 +1,11 @@
+<!doctype html>
+<title>CSS Test Reference</title>
+<style>
+body { margin: 0 }
+div {
+  width: 100px;
+  height: 50px;
+  background: lime;
+}
+</style>
+<div></div.
diff --git a/css/css-backgrounds/background-size-cover-003.tentative.html b/css/css-backgrounds/background-size-cover-003.tentative.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<title>CSS Test: background-size: cover with zero-sized background positioning area.</title>
+<link rel="help" href="https://drafts.csswg.org/css-backgrounds/#valdef-background-size-cover">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/4049">
+<link rel="help" href=" https://bugzilla.mozilla.org/show_bug.cgi?id=1559094">
+<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
+<link rel="author" href="https://mozilla.org" title="Mozilla">
+<link rel="match" href="background-size-cover-003-ref.html">
+<style>
+body { margin: 0 }
+div {
+  background-size: cover;
+  background-repeat: no-repeat;
+  background-position: top left;
+  background-origin: content-box;
+  background-image: url(/images/green-100x50.png);
+}
+#test1 {
+  height: 0;
+  width: 100px;
+  padding-bottom: 100px;
+}
+
+#test2 {
+  height: 100px;
+  width: 0;
+  padding-left: 100px;
+}
+#test3 {
+  height: 0;
+  width: 0;
+  padding-left: 100px;
+  padding-bottom: 100px;
+}
+</style>
+<div id="test1"></div>
+<div id="test2"></div>
+<div id="test3"></div>