File: scroll-and-root-margin.html

package info (click to toggle)
thunderbird 1%3A143.0.1-1
  • links: PTS, VCS
  • area: main
  • in suites: experimental
  • size: 4,703,968 kB
  • sloc: cpp: 7,770,492; javascript: 5,943,842; ansic: 3,918,754; python: 1,418,263; xml: 653,354; asm: 474,045; java: 183,079; sh: 111,238; makefile: 20,410; perl: 14,359; objc: 13,059; yacc: 4,583; pascal: 3,405; lex: 1,720; ruby: 999; exp: 762; sql: 715; awk: 580; php: 436; lisp: 430; sed: 69; csh: 10
file content (37 lines) | stat: -rw-r--r-- 1,126 bytes parent folder | download | duplicates (14) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
 
<!DOCTYPE html>
<meta name="viewport" content="width=device-width,initial-scale=1">
<link rel="help" href="https://www.w3.org/TR/intersection-observer/#dom-intersectionobserver-scrollmargin">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="./resources/intersection-observer-test-utils.js"></script>

<style>
#spacer { width: 50px; height: calc(100vh + 10px); }
#target { width: 50px; height: 50px; background-color: green; }
</style>

<div id=spacer></div>
<div id=target></div>

<script>
let entries = [];

window.onload = function() {
  runTestCycle(testIntersection, "Test scroll margin intersection");

  const observer = new IntersectionObserver(
    es => entries = entries.concat(es),
    {
      scrollMargin: "10px",
      rootMargin: "10px"
    }
  );
  observer.observe(target);
};

function testIntersection() {
  assert_equals(entries.length, 1, "IntersectionObserverEntryCount");
  assert_true(entries[0].isIntersecting, "isIntersecting");
  assert_approx_equals(entries[0].intersectionRatio, 0.04, 0.0001, "intersectionRatio");
}
</script>