css/css-values/container-progress-computed.tentative.html

<!DOCTYPE html>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="help" href="https://drafts.csswg.org/css-values-5/#container-progress-func">
<link rel="author" title="sakhapov@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../support/numeric-testcommon.js"></script>
<div id="out-of-scope-container"></div>
<div id="extra-container">
  <div id="outer-container">
    <div id="inner-container">
      <div id=target></div>
    </div>
  </div>
</div>
<style>
:root {
  font-size: 10px;
  width: 100vw;
  height: 100vh;
}
#out-of-scope-container {
  container: my-container-3 / size;
  width: 1px;
  height: 1px;
}
#extra-container {
  container: my-container-2 / size;
  width: 5051px;
  height: 1337px;
}
#outer-container {
  container: my-container / size;
  width: 322px;
  height: 228px;
}
#inner-container {
  container-type: size;
  width: 228px;
  height: 322px;
}
#target {
  font-size: 10px;
}
</style>
<script>

// innerWidth and innerHeight have lossy precision, see
// https://github.com/w3c/csswg-drafts/issues/5260.
let { width, height } = document.documentElement.getBoundingClientRect();

let extraWidth = 5051;
let extraHeight = 1337;
let innerWidth = 228;
let innerHeight = 322;
let outerWidth = 322;
let outerHeight = 228;

// Identity tests
test_math_used('container-progress(height, 0px, 1px)', innerHeight, {type:'number'});
test_math_used('container-progress(width of my-container, 0px, 1px)', outerWidth, {type:'number'});

// Nestings
test_math_used('container-progress(height, container-progress(height, 0px, 1px) * 1px, container-progress(height, 0px, 1px) * 1px)', '0', {type:'number'});
test_math_used('container-progress(height, container-progress(height, 0px, 1px) * 0.5px, container-progress(height, 0px, 1px) * 1px)', '1', {type:'number'});
test_math_used('container-progress(height, container-progress(width of my-container, 0px, 1px) * 1px, container-progress(height of my-container-2, 0px, 1px) * 1px)', (innerHeight - outerWidth) / (extraHeight - outerWidth), {type:'number'});

// General calculations
test_math_used('calc(container-progress(width, 0px, 50px) * 10px + 100px)', (innerWidth / 50 * 10 + 100) + 'px');
test_math_used('calc(container-progress(height, 10px, sign(50px - 500em) * 10px))', (innerHeight - 10) / (-10 - 10), {type:'number'});
test_math_used('calc(container-progress(width of my-container, 0px, 50px) * 10px + 100px)', (outerWidth / 50 * 10 + 100) + 'px');
test_math_used('calc(container-progress(height of my-container, 10px, sign(50px - 500em) * 10px))', (outerHeight - 10) / (-10 - 10), {type:'number'});

// Fallback
test_math_used('container-progress(width of non-existing-container, 0px, 1px)', width, {type:'number', msg: 'container-progress() width fallback for non-existing container name'});
test_math_used('container-progress(height of non-existing-container, 0px, 1px)', height, {type:'number', msg: 'container-progress() height fallback for non-existing container names'});
test_math_used('container-progress(width of out-of-scope-container, 0px, 1px)', width, {type:'number', msg: 'container-progress() width fallback for out of scope container'});
test_math_used('container-progress(height of out-of-scope-container, 0px, 1px)', height, {type:'number', msg: 'container-progress() height fallback for out of scope container'});

// Type checking
test_math_used('calc(container-progress(width, 0px, 1px) * 1px)', innerWidth + 'px');
test_math_used('calc(container-progress(height of my-container, 0px, 1px) * 1s)', outerHeight + 's', {type:'time'});
test_math_used('calc(container-progress(width of my-container-2, 0px, 1px) * 1deg)', extraWidth + 'deg', {type:'angle', approx:0.001});
</script>