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/**
* Remove the `reftest-wait` class on the document element.
* The reftest runner will wait with taking a screenshot while
* this class is present.
*
*/
function takeScreenshot() {
document.documentElement.classList.remove("reftest-wait");
}
/**
* Call `takeScreenshot()` after a delay of at least |timeout| milliseconds.
* @param {number} timeout - milliseconds
*/
function takeScreenshotDelayed(timeout) {
setTimeout(function() {
takeScreenshot();
}, timeout);
}
/**
* Ensure that a precondition is met before waiting for a screenshot.
* @param {bool} condition - Fail the test if this evaluates to false
* @param {string} msg - Error message to write to the screenshot
*/
function failIfNot(condition, msg) {
const fail = () => {
(document.body || document.documentElement).textContent = `Precondition Failed: ${msg}`;
takeScreenshot();
};
if (!condition) {
if (document.readyState == "interactive") {
fail();
} else {
document.addEventListener("DOMContentLoaded", fail, false);
}
}
}