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<!DOCTYPE html>
<meta charset="UTF-8">
<title>CSS Values and Units Test: computed value of 'z-index' when specified with calc() function and fractional values</title>
<link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
<link rel="help" href="https://www.w3.org/TR/css-values-4/#calc-range">
<meta content="This test verifies how 2 calc() functions are computed for 'z-index' when involved expressions end up being numbers halfway between adjacent integers." name="assert">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="target"></div>
<script>
function startTesting()
{
var targetElement = document.getElementById("target");
function verifyComputedStyle(property_name, initial_value, specified_value, expected_value)
{
test(function()
{
targetElement.style.setProperty(property_name, initial_value);
/*
The purpose of the initial_value is to act as a fallback
value in case the calc() function in the specified value
fails or in case it generates an invalid value. Since we
are running 2 consecutive tests on the same element,
then it is necessary to reset its property to an initial
value.
*/
targetElement.style.setProperty(property_name, specified_value);
assert_equals(getComputedStyle(targetElement)[property_name], expected_value);
}, `testing ${property_name}: ${specified_value}`);
}
/* verifyComputedStyle(property_name, initial_value, specified_value, expected_value) */
verifyComputedStyle("z-index", "auto", "calc(2.5 / 2)", "1");
verifyComputedStyle("z-index", "auto", "calc(3 / 2)", "2");
verifyComputedStyle("z-index", "auto", "calc(3.5 / 2)", "2");
verifyComputedStyle("z-index", "auto", "calc(-2.5 / 2)", "-1");
verifyComputedStyle("z-index", "auto", "calc(-3 / 2)", "-1");
verifyComputedStyle("z-index", "auto", "calc(-3.5 / 2)", "-2");
}
startTesting();
</script>
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