| <!DOCTYPE HTML> |
| <html> |
| <head> |
| <style> |
| body { |
| margin: 0; |
| width: 100%; |
| height: 100%; |
| overflow-x: none; |
| overflow-y: scroll; |
| position: absolute; |
| scroll-snap-type: y proximity; |
| } |
| |
| .area { |
| width: 100%; |
| height: 100%; |
| float: left; |
| opacity: 0.5; |
| scroll-snap-align: start; |
| } |
| |
| #output { |
| position: fixed; |
| } |
| </style> |
| <script> |
| let write = s => output.innerHTML += s + "<br>"; |
| if (window.testRunner) { |
| testRunner.dumpAsText(); |
| testRunner.waitUntilDone(); |
| } |
| |
| function verticalScrollInBody(dragDeltas) |
| { |
| return new Promise(resolve => { |
| write(`Scrolling body with ${dragDeltas.length} drag ticks`); |
| eventSender.monitorWheelEvents(); |
| internals.setPlatformMomentumScrollingPredictionEnabled(false); |
| eventSender.mouseMoveTo(window.innerWidth / 2, window.innerHeight / 2); |
| dragDeltas.forEach((delta, i) => eventSender.mouseScrollByWithWheelAndMomentumPhases(0, delta, i == 0 ? "began" : "changed", "none")); |
| eventSender.mouseScrollByWithWheelAndMomentumPhases(0, 0, "ended", "none"); |
| eventSender.callAfterScrollingCompletes(() => { |
| let areaHeight = document.querySelector(".area").clientHeight; |
| write(`- Did the scrolling snap to the top? ${document.scrollingElement.scrollTop == 0 ? "YES" : "NO"}`); |
| write(`- Did scrolling snap to the second box? ${document.scrollingElement.scrollTop == areaHeight ? "YES" : "NO"}`); |
| document.scrollingElement.scrollTop = 0; |
| setTimeout(resolve, 0); |
| }); |
| }); |
| } |
| |
| function run() { |
| if (!window.testRunner || !window.eventSender) { |
| write("To manually test, verify that scrolling near one of the boundaries between the colored boxes"); |
| write("snaps to the edge of the nearest colored box, but scrolling somewhere near the middle of two"); |
| write("boxes does not cause the scroll offset to snap."); |
| return; |
| } |
| |
| let areaHeight = document.querySelector(".area").clientHeight; |
| verticalScrollInBody(new Array(2).fill(-1)) |
| .then(() => verticalScrollInBody(new Array(Math.round(areaHeight / 20)).fill(-1))) |
| .then(() => verticalScrollInBody(new Array(Math.round(areaHeight / 10)).fill(-1))) |
| .then(() => testRunner.notifyDone()); |
| } |
| </script> |
| </head> |
| <body onload=run()> |
| <div class="area" style="background-color: red;"></div> |
| <div class="area" style="background-color: green;"></div> |
| <div class="area" style="background-color: blue;"></div> |
| <div class="area" style="background-color: aqua;"></div> |
| <div class="area" style="background-color: yellow;"></div> |
| <div class="area" style="background-color: fuchsia;"></div> |
| </body> |
| <div id="output"></div> |
| </html> |
