exclude-fixed-position.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-scroll-anchoring/exclude-fixed-position.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<style>

body { height: 4000px; margin: 0; }

#fixed, #content { width: 200px; height: 100px; }

#fixed { position: fixed; left: 100px; top: 50px; }

#before { height: 50px; }

#content { margin-top: 100px; }

</style>

<div id="fixed">fixed</div>

<div id="before"></div>

<div id="content">content</div>

<script>

// Tests that the anchor selection algorithm skips fixed-positioned elements.

test(() => {

  document.scrollingElement.scrollTop = 100;

  document.querySelector("#before").style.height = "100px";

  assert_equals(document.scrollingElement.scrollTop, 150);

}, "Fixed-position header.");

</script>