reftest-wait.js (1165B)
1 /** 2 * Remove the `reftest-wait` class on the document element. 3 * The reftest runner will wait with taking a screenshot while 4 * this class is present. 5 * 6 * See https://web-platform-tests.org/writing-tests/reftests.html#controlling-when-comparison-occurs 7 */ 8 function takeScreenshot() { 9 document.documentElement.classList.remove("reftest-wait"); 10 } 11 12 /** 13 * Call `takeScreenshot()` after a delay of at least |timeout| milliseconds. 14 * @param {number} timeout - milliseconds 15 */ 16 function takeScreenshotDelayed(timeout) { 17 setTimeout(function() { 18 takeScreenshot(); 19 }, timeout); 20 } 21 22 /** 23 * Ensure that a precondition is met before waiting for a screenshot. 24 * @param {bool} condition - Fail the test if this evaluates to false 25 * @param {string} msg - Error message to write to the screenshot 26 */ 27 function failIfNot(condition, msg) { 28 const fail = () => { 29 (document.body || document.documentElement).textContent = `Precondition Failed: ${msg}`; 30 takeScreenshot(); 31 }; 32 if (!condition) { 33 if (document.readyState == "interactive") { 34 fail(); 35 } else { 36 document.addEventListener("DOMContentLoaded", fail, false); 37 } 38 } 39 }