| <!doctype html> |
| <html> |
| <head> |
| <title>content-visibility demo</title> |
| <style> |
| body { |
| zoom: 60%; |
| } |
| #contents { |
| margin: auto; |
| text-align: center; |
| max-width: 600px; |
| } |
| |
| #contents > div { |
| border: 1px solid black; |
| border-radius: 2px; |
| margin: 1em; |
| min-height: 300px; |
| } |
| |
| .cv-auto { |
| content-visibility: auto; |
| } |
| |
| .tall { |
| height: 3000px; |
| background-color: silver; |
| } |
| </style> |
| <script src="../../resources/js-test.js"></script> |
| <script src="../../resources/ui-helper.js"></script> |
| <script> |
| window.testRunner?.waitUntilDone(); |
| |
| let lastSkipped = false; |
| window.addEventListener('load', async () => { |
| const target = document.getElementById('target'); |
| |
| await UIHelper.ensureStablePresentationUpdate(); |
| shouldBe('lastSkipped', 'false'); |
| |
| const visibilityChangePromise = new Promise((resolve) => { |
| target.addEventListener('contentvisibilityautostatechange', (event) => { |
| lastSkipped = event.skipped; |
| resolve(); |
| }); |
| |
| const scrollDistance = 300 * 0.6 + 15; |
| window.scrollTo(0, scrollDistance); |
| }); |
| |
| await visibilityChangePromise; |
| shouldBe('lastSkipped', 'true'); |
| |
| await UIHelper.renderingUpdate(); |
| shouldBe('lastSkipped', 'true'); |
| |
| window.testRunner?.notifyDone() |
| }, false); |
| </script> |
| </head> |
| <body> |
| <div id="contents"> |
| <div id="target" class="cv-auto"></div> |
| <div class="tall"></div> |
| </div> |
| <div id="console"></div> |
| </body> |
| </html> |
