| <!-- Quirks mode --> |
| <html> |
| <head> |
| <title>ScrollTimeline default source in quirks mode</title> |
| <link rel="help" href="https://drafts.csswg.org/scroll-animations-1/#dom-scrolltimeline-scrolltimeline"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| /* This is just to make it possible for #body1 to be |
| "potentially scrollable". |
| |
| https://drafts.csswg.org/cssom-view/#potentially-scrollable */ |
| html { |
| overflow: hidden; |
| } |
| </style> |
| </head> |
| <body id=body1></body> |
| <script> |
| test(() => { |
| try { |
| assert_equals(document.scrollingElement.id, 'body1'); |
| assert_equals(new ScrollTimeline({}).scrollSource, body1); |
| |
| // Make #body1 "potentially scrollable". This causes the scrollingElement |
| // of the document to become null. |
| // |
| // https://drafts.csswg.org/cssom-view/#dom-document-scrollingelement |
| body1.style = 'overflow:scroll'; |
| assert_equals(new ScrollTimeline({}).scrollSource, null); |
| } finally { |
| body1.style = ''; |
| } |
| }, 'Style of <body> is reflected in scrollSource attribute in quirks mode'); |
| </script> |
| </html> |
