| <!DOCTYPE html> |
| <html> |
| <head> |
| <style> |
| :root { |
| scroll-snap-type: y mandatory; |
| overflow-x: hidden; |
| } |
| |
| body, html { |
| width: 100%; |
| height: 100%; |
| margin: 0; |
| } |
| |
| .snap { |
| width: 100%; |
| height: 100%; |
| scroll-snap-align: start; |
| } |
| |
| #extra-tall { |
| height: 150%; |
| } |
| |
| .output { |
| color: white; |
| position: fixed; |
| top: 0; |
| } |
| </style> |
| <script src="../../resources/js-test.js"></script> |
| <script src="../../resources/ui-helper.js"></script> |
| <script> |
| jsTestIsAsync = true; |
| |
| addEventListener("load", async () => { |
| description(`This test verifies that discrete wheel events trigger scroll snapping in the mainframe. |
| To manually run the test, scroll using a physical mouse wheel and verify that a single scroll |
| tick animates to the next snap point, and a second scroll tick should not trigger snapping (due |
| to the content being too tall)`); |
| |
| if (!window.testRunner) |
| return; |
| |
| await UIHelper.statelessMouseWheelScrollAt(100, 100, 0, -1); |
| await shouldBecomeEqual("pageYOffset", "600"); |
| await UIHelper.statelessMouseWheelScrollAt(200, 200, 0, -1); |
| await shouldBecomeEqual("pageYOffset > 600", "true"); |
| shouldBeTrue("pageYOffset < 1500"); |
| |
| finishJSTest(); |
| }); |
| </script> |
| </head> |
| <body> |
| <div class="snap" id="first-container" style="background: #80475E"></div> |
| <div class="snap" id="extra-tall" style="background: #CC5A71"></div> |
| <div class="snap" style="background: #32228B"></div> |
| <div class="output"> |
| <pre id="description"></pre> |
| <pre id="console"></pre> |
| </div> |
| </body> |
| </html> |
