| <!DOCTYPE html> |
| <title>Element.scroll* methods returning promises</title> |
| <meta name="timeout" content="long"> |
| <meta name="viewport" content="width=device-width,initial-scale=1"> |
| <link rel="author" title="Mustaq Ahmed" href="mailto:mustaq@chromium.org"> |
| <link rel="help" href="https://drafts.csswg.org/cssom-view/#extension-to-the-element-interface"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/dom/events/scrolling/scroll_support.js"></script> |
| <style> |
| .filler { height: 5000px } |
| |
| #scroller { |
| overflow: scroll; |
| width: 100px; |
| height: 100px; |
| } |
| </style> |
| <div id="scroller"> |
| <div class="filler"></div> |
| <div class="filler"></div> |
| </div> |
| <script> |
| "use strict"; |
| |
| const scroller = document.getElementById("scroller"); |
| const scroll_methods = ["scroll", "scrollTo", "scrollBy", "scrollIntoView"]; |
| |
| function reset() { |
| scroller.scrollTo({ top: 0 }); |
| assert_equals(scroller.scrollTop, 0, "Sanity check starting position"); |
| } |
| |
| promise_setup(async () => { |
| await waitForCompositorReady(); |
| }); |
| |
| for (const scroll_method of scroll_methods) { |
| for (const behavior of ["auto", "instant", "smooth"]) { |
| const test_label = `Element.${scroll_method}(${behavior})`; |
| |
| promise_test(async () => { |
| let result = scroller[scroll_method]({ behavior: behavior }); |
| assert_true(result instanceof Promise); |
| }, `${test_label}: return type`); |
| |
| promise_test(async () => { |
| reset(); |
| const offset = 5000; |
| |
| let promise = (scroll_method != "scrollIntoView") ? |
| scroller[scroll_method]({ top: offset, behavior: behavior }) : |
| scroller.lastElementChild.scrollIntoView({ behavior: behavior }); |
| |
| if (behavior != "smooth") { |
| assert_equals(scroller.scrollTop, offset, "Position before await"); |
| } else { |
| assert_true(0 <= scroller.scrollTop && scroller.scrollTop < offset, |
| "Position before await"); |
| } |
| |
| await promise; |
| assert_equals(scroller.scrollTop, offset, "Position after await"); |
| }, `${test_label}: promise behavior`); |
| } |
| } |
| </script> |
