| <!DOCTYPE html> |
| <html> |
| <meta name="viewport" content="width=device-width,initial-scale=1"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/resources/testdriver.js"></script> |
| <script src="/resources/testdriver-actions.js"></script> |
| <script src="/resources/testdriver-vendor.js"></script> |
| <script src="support/action-utils.js"></script> |
| <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1951021"> |
| <link rel="help" href="https://drafts.csswg.org/cssom-view/#perform-a-scroll"> |
| <style> |
| body { |
| margin: 0px; |
| padding: 0px; |
| } |
| #container { |
| position: fixed; |
| width: 100%; |
| height: 100%; |
| top: 0px; |
| left: 0px; |
| } |
| #banner { |
| position: fixed; |
| bottom: 0px; |
| left: 0px; |
| right: 0px; |
| background-color: blue; |
| } |
| </style> |
| <div id="anchor"></div> |
| <div id="container"> |
| <aside id="banner"></aside> |
| </div> |
| <script> |
| promise_test(async t => { |
| assert_equals(window.scrollY, 0); |
| assert_equals(visualViewport.scale, 1.0); |
| assert_equals(visualViewport.pageTop, 0); |
| |
| // Pinch zoom in this document. |
| await pinch_zoom_action(); |
| |
| assert_greater_than(visualViewport.scale, 1.0); |
| |
| // Suppose that the pinch zoom-in gesture at the center of the document did |
| // move the visual viewport offset. |
| assert_greater_than(visualViewport.pageTop, 0); |
| |
| // Move to zero offset of the visual viewport. |
| let scrollPromise = |
| new Promise(resolve => visualViewport.addEventListener("scroll", resolve)); |
| document.querySelector('#anchor').scrollIntoView({ behavior: "instant" }); |
| await scrollPromise; |
| |
| assert_equals(visualViewport.pageTop, 0); |
| |
| // Now trigger a scrollIntoView call to an element inside nested position:fixed elements. |
| scrollPromise = |
| new Promise(resolve => visualViewport.addEventListener("scroll", resolve)); |
| document.querySelector("#banner").scrollIntoView({ behavior: "instant" }); |
| await scrollPromise; |
| |
| assert_greater_than(visualViewport.pageTop, 0); |
| }, "Element.scrollIntoView scrolls visually to an element in nested position: fixed elements"); |
| </script> |
