Quelle  canvas-drag.html   Sprache: HTML

<!doctype html>
<meta charset="utf-8">
<title>Dragging on a text-selectable canvas should not select it</title>
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<link rel="author" href="https://mozilla.com" title="Mozilla">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1969829">
<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>
<style>
  canvas {
    outline: 2px solid hotpink;
    background-color: green;
    width: 200px;
    height: 200px;
  }
</style>
Dragging across the green square should not select it.<br>
<canvas></canvas>
<script>
promise_test(async function() {
  let canvas = document.querySelector("canvas");
  let rect = canvas.getBoundingClientRect();
  await new test_driver.Actions()
    .pointerMove(rect.left + 2, rect.top + 2)
    .pointerDown()
    .pointerMove(rect.right - 2, rect.top + 2)
    .pointerUp()
    .send();
  assert_true(getSelection().isCollapsed, "Dragging a canvas shouldn't generate a non-collapsed selection");
});
</script>