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73 lines
2.9 KiB
JavaScript
73 lines
2.9 KiB
JavaScript
'use strict';
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/**
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* Create test that a CSS property computes to the expected value.
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* The document element #target is used to perform the test.
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*
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* @param {string} property The name of the CSS property being tested.
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* @param {string} specified A specified value for the property.
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* @param {string|array} computed The expected computed value,
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* or an array of permitted computed value.
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* If omitted, defaults to specified.
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*/
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function test_computed_value(property, specified, computed, titleExtra) {
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if (!computed)
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computed = specified;
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test(() => {
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const target = document.getElementById('target');
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assert_true(property in getComputedStyle(target), property + " doesn't seem to be supported in the computed style");
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assert_true(CSS.supports(property, specified), "'" + specified + "' is a supported value for " + property + ".");
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target.style[property] = '';
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target.style[property] = specified;
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let readValue = getComputedStyle(target)[property];
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if (Array.isArray(computed)) {
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assert_in_array(readValue, computed);
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} else {
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assert_equals(readValue, computed);
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}
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if (readValue !== specified) {
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target.style[property] = '';
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target.style[property] = readValue;
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assert_equals(getComputedStyle(target)[property], readValue,
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'computed value should round-trip');
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}
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}, `Property ${property} value '${specified}'${titleExtra ? ' ' + titleExtra : ''}`);
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}
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function test_pseudo_computed_value(pseudo, property, specified, computed, titleExtra) {
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if (!computed)
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computed = specified;
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test(() => {
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assert_true(/^::\w+$/.test(pseudo), pseudo + " doesn't seem to be a pseudo-element");
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const styleElement = document.createElement("style");
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document.documentElement.appendChild(styleElement);
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try {
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const {sheet} = styleElement;
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sheet.insertRule("#target" + pseudo + "{}");
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const {style} = sheet.cssRules[0];
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const target = document.getElementById('target');
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assert_true(property in getComputedStyle(target, pseudo), property + " doesn't seem to be supported in the computed style");
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assert_true(CSS.supports(property, specified), "'" + specified + "' is a supported value for " + property + ".");
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style[property] = specified;
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let readValue = getComputedStyle(target, pseudo)[property];
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if (Array.isArray(computed)) {
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assert_in_array(readValue, computed);
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} else {
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assert_equals(readValue, computed);
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}
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if (readValue !== specified) {
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style[property] = '';
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style[property] = readValue;
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assert_equals(getComputedStyle(target, pseudo)[property], readValue,
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'computed value should round-trip');
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}
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} finally {
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document.documentElement.removeChild(styleElement);
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}
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}, `Property ${property} value '${specified}' in ${pseudo}${titleExtra ? ' ' + titleExtra : ''}`);
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}
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