<!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="GĂ©rard 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, description) | |
{ | |
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); | |
}, description); | |
} | |
/* verifyComputedStyle(property_name, initial_value, specified_value, expected_value, description) */ | |
verifyComputedStyle("z-index", "auto", "calc(2.5 / 2)", "1", "testing z-index: calc(2.5 / 2)"); | |
verifyComputedStyle("z-index", "auto", "calc(3 / 2)", "2", "testing z-index: calc(3 / 2)"); | |
verifyComputedStyle("z-index", "auto", "calc(3.5 / 2)", "2", "testing z-index: calc(3.5 / 2)"); | |
verifyComputedStyle("z-index", "auto", "calc(-2.5 / 2)", "-1", "testing z-index: calc(-2.5 / 2)"); | |
verifyComputedStyle("z-index", "auto", "calc(-3 / 2)", "-1", "testing z-index: calc(-3 / 2)"); | |
verifyComputedStyle("z-index", "auto", "calc(-3.5 / 2)", "-2", "testing z-index: calc(-3.5 / 2)"); | |
} | |
startTesting(); | |
</script> |