css/css-values/calc-rounds-to-integer.html

<!doctype html>
<title>Calc rounds to integer</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<link rel=author title="Tab Atkins-Bittner" href="https://www.xanthir.com/contact/">
<link rel="help" href="https://drafts.csswg.org/css-values/#calc-range">
<link rel="help" href="https://drafts.csswg.org/css-easing/#funcdef-step-easing-function-steps">
<link rel="help" href="https://drafts.csswg.org/css-multicol-2/#column-span">
<link rel="help" href="https://drafts.csswg.org/css-lists/#propdef-counter-reset">
<link rel="help" href="https://drafts.csswg.org/css-lists/#propdef-counter-increment">
<link rel="help" href="https://drafts.csswg.org/css-lists/#propdef-counter-set">
<link rel="help" href="https://drafts.csswg.org/css-fonts-4/#font-feature-settings-prop">
<link rel="help" href="https://drafts.csswg.org/css-grid/#propdef-grid-template-rows">
<link rel="help" href="https://drafts.csswg.org/css-grid/#propdef-grid-row">
<link rel="help" href="https://drafts.csswg.org/css-text-4/#propdef-hyphenate-limit-chars">
<link rel="help" href="https://drafts.csswg.org/css-text-4/#propdef-hyphenate-limit-lines">
<link rel="help" href="https://drafts.csswg.org/css-inline-3/#propdef-initial-letter">
<link rel="help" href="https://drafts.csswg.org/css-overflow-4/#propdef-max-lines">
<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#propdef-order">
<link rel="help" href="https://drafts.csswg.org/css-break-4/#propdef-orphans">
<link rel="help" href="https://drafts.csswg.org/css-writing-modes-4/#propdef-text-combine-upright">
<link rel="help" href="https://drafts.csswg.org/css-break-4/#propdef-widows">
<link rel="help" href="https://drafts.csswg.org/css2/#propdef-z-index">
<!--
  Verifying that, per V&U, a calc() that results in a non-integer value
  gets rounded to the nearest integer
  when used in a place that requires <integer> specifically.
  This tests both straight-up decimal-point values,
  and scinot, which is defined to parse as <number-token>.
-->
<body>

<script>

runTests("animation-timing-function", "steps(xxx)");
runTests("column-span");
runTests("counter-increment", "foo xxx");
runTests("counter-reset", "foo xxx");
runTests("counter-set", "foo xxx");
runTests("font-feature-settings", '"fooo" xxx');
runTests("grid-row");
runTests("grid-template-rows", "repeat(xxx, 10px)");
runTests("hyphenate-limit-chars");
runTests("hyphenate-limit-lines");
runTests("initial-letter", "1.1 xxx");
runTests("max-lines");
runTests("order");
runTests("orphans");
runTests("text-combine-upright", "digits xxx");
runTests("transition-timing-function", "steps(xxx)");
runTests("widows");
runTests("z-index");


function runTests(prop, valPattern="xxx") {
    const el = document.body;

    // Don't spuriously fail bc the prop or val isn't supported.
    if(!verifySupport(el, prop, valPattern)) return;

    const validValues = [
        "10",
        "calc(10)",
        "calc(10.1)",
        "calc(1e1)",
        "calc(1.1e1)",
    ];
    const invalidValues = [
        "1e1",
        "1.1e1",
        "10.1",
    ];
    for(let testVal of validValues) {
        testInt(el, prop, testVal, valPattern);
    }
    for(let testVal of invalidValues) {
        testIntInvalid(el, prop, testVal, valPattern);
    }
}

function verifySupport(el, prop, valPattern) {
    let testVal = "10";
    if(valPattern !== undefined) {
        testVal = valPattern.replace("xxx", testVal);
    }
    el.removeAttribute("style");
    const nullVal = getComputedStyle(el)[prop];
    el.style.setProperty(prop, testVal);
    return getComputedStyle(el)[prop] != nullVal;
}

function testInt(el, prop, testVal, valPattern) {
    // to avoid needing to specify serialization,
    // just test whether it parses at all
    if(valPattern !== undefined) {
        testVal = valPattern.replace("xxx", testVal);
    }
    test(()=>{
        el.removeAttribute("style");
        const nullVal = getComputedStyle(el)[prop];
        el.style.setProperty(prop, testVal);
        assert_not_equals(getComputedStyle(el)[prop], nullVal);
    }, `${prop} should accept "${testVal}"`)
}

function testIntInvalid(el, prop, testVal, valPattern) {
    // similarly, just verify it doesn't parse at all
    if(valPattern !== undefined) {
        testVal = valPattern.replace("xxx", testVal);
    }
    test(()=>{
        el.removeAttribute("style");
        const nullVal = getComputedStyle(el)[prop];
        el.style.setProperty(prop, testVal);
        assert_equals(getComputedStyle(el)[prop], nullVal);
    }, `${prop} should not accept "${testVal}"`)
}

</script>