File: test_variables_loop.html

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<!DOCTYPE html>
<title>CSS variables loop resolving</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css" type="text/css">
<style id="test">
  #outer {
    --a: a;
    --b: b;
    --c: c;
    --d: d;
    --e: e;
  }
  #inner {
    --a: var(--d, ad);
    --b: var(--d, ad);
    --c: var(--d, ad);
    --d: var(--e, de);
    --e: var(--a, ea) var(--b, eb) var(--c, ec);
  }
</style>
<div id="outer">
  <div id="inner"></div>
</div>
<script>
let inner_cs = getComputedStyle(document.getElementById("inner"));
for (let v of ['a', 'b', 'c', 'd', 'e']) {
  is(inner_cs.getPropertyValue(`--${v}`), "",
     `Variable --${v} should be eliminated`);
}
</script>