| <!DOCTYPE html> |
| <html> |
| |
| <head> |
| <meta charset="utf-8"> |
| <title> CSS Scroll Snap 2 Test: scroll-initial-target interaction with anchor navigation</title> |
| <link rel="help" href="https://drafts.csswg.org/css-scroll-snap-2/#scroll-initial-target"> |
| <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="/html/browsers/browsing-the-web/resources/helpers.js"></script> |
| <script src="/dom/events/scrolling/scroll_support.js"></script> |
| </head> |
| |
| <body> |
| <iframe id="frame" src="scroll-initial-target-with-anchor-navigation-inner-frame.html" onload="runTest()"></iframe> |
| <script> |
| function runTest() { |
| promise_test(async (t) => { |
| await waitForCompositorCommit(); |
| let scroller = frame.contentDocument.scrollingElement; |
| // anchor_target is at the bottom of the frame so the frame should be |
| // fully scrolled down to bring it into view. |
| let anchor_target_scrolltop = scroller.scrollHeight - scroller.clientHeight; |
| let anchor_target_link = frame.contentDocument.getElementById("anchor_target_link"); |
| |
| // Expect scroll offset of 100px per scroll-start. |
| const scroll_start_target_top = 0.6 * frame.contentWindow.innerHeight; |
| assert_equals(scroller.scrollTop, scroll_start_target_top, |
| "scroll-initial-target sets initial scroll offset"); |
| |
| // Scroll away from start position. |
| scroller.scrollTop = 200; |
| assert_equals(scroller.scrollTop, 200, |
| "scrolled away from scroll-initial-target"); |
| |
| anchor_target_link.click(); |
| await waitForHashchange(frame.contentWindow); |
| assert_equals(frame.contentWindow.location.hash, "#anchor_target", |
| "clicking anchor link navigates to target"); |
| |
| // Expect page to be fully scrolled as anchor_target is at the bottom of |
| // the document. |
| assert_equals(scroller.scrollTop, anchor_target_scrolltop, |
| "anchor navigation sets scroll offset"); |
| |
| frame.contentWindow.history.back(); |
| await waitForHashchange(frame.contentWindow); |
| assert_equals(frame.contentWindow.location.hash, ""); |
| |
| assert_equals(scroller.scrollTop, 200, |
| "scroller returns to previous scroll position, not " + |
| "scroll-initial-target"); |
| }, "scroll-initial-target does not override anchor navigation."); |
| } |
| </script> |
| </body> |
| |
