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