Content - 9dc9d7e50bb3de8a2dcc899287aeb990d637bdc7 - 8bff186/css/css-properties-values-api/registered-property-cssom.html

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Tip revision: 7578e333cabf4c2ddeaed1a9fc57cbc18502bc02 authored by Jonathon Kereliuk on 21 March 2018, 14:01:39 UTC
fix trailing whitespace

Tip revision: 7578e33

registered-property-cssom.html

<!DOCTYPE HTML>
<link rel="help" href="https://drafts.css-houdini.org/css-properties-values-api/#dom-css-registerproperty" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<style>
#inner {
  --length: 10px;
  --color: red;
}
#outer {
  --length: 77px;
  --color: blue;
}
</style>

<div id=outer>
  <div id=inner></div>
</div>

<script>
var computedStyle = getComputedStyle(inner);
var inlineStyle = inner.style;
var sheetStyle = document.styleSheets[0].cssRules[0].style;

test(function() {
  // Nothing registered yet, whatever you specify works
  assert_equals(computedStyle.getPropertyValue('--length'), ' 10px');
  assert_equals(computedStyle.getPropertyValue('--color'), ' red');

  inlineStyle.setProperty('--length', '5');
  inlineStyle.setProperty('--color', 'hello');

  assert_equals(inlineStyle.getPropertyValue('--length'), '5');
  assert_equals(inlineStyle.getPropertyValue('--color'), 'hello');
  assert_equals(computedStyle.getPropertyValue('--length'), '5');
  assert_equals(computedStyle.getPropertyValue('--color'), 'hello');
}, "CSSOM setters function as expected for unregistered properties");

CSS.registerProperty({name: '--length', syntax: '<length>', initialValue: '0px'});
CSS.registerProperty({name: '--color', syntax: '<color>', initialValue: 'white', inherits: true});

test(function() {
  assert_equals(inlineStyle.getPropertyValue('--length'), '5');
  assert_equals(inlineStyle.getPropertyValue('--color'), 'hello');
  assert_equals(computedStyle.getPropertyValue('--length'), '0px');
  assert_equals(computedStyle.getPropertyValue('--color'), 'blue');
}, "Formerly valid values are still readable from inline styles but are computed as the unset value");

test(function() {
  inlineStyle.setProperty('--length', 'hi');
  inlineStyle.setProperty('--color', '20');
  assert_equals(inlineStyle.getPropertyValue('--length'), '5');
  assert_equals(inlineStyle.getPropertyValue('--color'), 'hello');
}, "Values not matching the registered type can't be set");

test(function() {
  inlineStyle.removeProperty('--length');
  inlineStyle.setProperty('--color', '');
  assert_equals(inlineStyle.getPropertyValue('--length'), '');
  assert_equals(inlineStyle.getPropertyValue('--color'), '');
  assert_equals(computedStyle.getPropertyValue('--length'), '10px');
  assert_equals(computedStyle.getPropertyValue('--color'), 'red');
}, "Values can be removed from inline styles");

test(function() {
  sheetStyle.setProperty('--length', 'banana'); // Invalid, no change
  assert_equals(computedStyle.getPropertyValue('--length'), '10px');
  sheetStyle.setProperty('--length', '20px');
  assert_equals(computedStyle.getPropertyValue('--length'), '20px');
  sheetStyle.setProperty('--length', 'initial');
  assert_equals(computedStyle.getPropertyValue('--length'), '0px');
}, "Stylesheets can be modified by CSSOM");

test(function() {
  inlineStyle.setProperty('--length', '30px');
  inlineStyle.setProperty('--color', 'pink');
  assert_equals(inlineStyle.getPropertyValue('--length'), '30px');
  assert_equals(inlineStyle.getPropertyValue('--color'), 'pink');
  assert_equals(computedStyle.getPropertyValue('--length'), '30px');
  assert_equals(computedStyle.getPropertyValue('--color'), 'pink');
  inlineStyle.setProperty('--color', 'inherit');
  assert_equals(inlineStyle.getPropertyValue('--color'), 'inherit');
  assert_equals(computedStyle.getPropertyValue('--color'), 'blue');
}, "Valid values can be set on inline styles");
</script>

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