frame-with-intersection-observer.html

<!DOCTYPE html>
<meta charset="utf-8">
<script src="/resources/testharness.js"></script>
<script src="utils.js"></script>
<div id="target" style="width: 100px; height: 100px; position: fixed; top: 0px; left: 0px"></div>
<script>
let next_token = 0;
function init() {
  const tokens = parseKeylist();
  let observer = new IntersectionObserver((entries) => {
    assert_equals(entries.length, 1);
    let rect = entries[0].intersectionRect.x + "," +
               entries[0].intersectionRect.y + "," +
               entries[0].intersectionRect.width + "," +
               entries[0].intersectionRect.height + "," +
               entries[0].isVisible;
    writeValueToServer(tokens[next_token], rect);
    next_token = next_token + 1;

    if (next_token == tokens.length) {
      observer.disconnect();
    }
  }, {trackVisibility: true, delay: 100, threshold: [0.6, 0.75]});
  observer.observe(document.getElementById("target"));
}

init();
</script>
</html>

chromium/third_party/blink/web_tests/external/wpt/fenced-frame/resources/frame-with-intersection-observer.html