It's available for Chrome, Microsoft Edge, Safari, Opera Next, and Firefox. This method has very idiosyncratic behavior. Tampermonkey Fired when the document has been completely loaded and parsed, without waiting for stylesheets, images, and subframes to finish loading. It is compatible with most legacy web browsers. web-vitals readyState; referrer; Deprecated rootElement; scripts; scrollingElement; DOMContentLoaded; fullscreenchange; fullscreenerror; lostpointercapture; In the DOM tree, the document fragment is replaced by all its children. Document Ready Document The DOMContentLoaded event fires when the initial HTML document has been completely loaded and parsed, without waiting for stylesheets, images, and subframes to finish loading. Since the document fragment is in memory and not part of the main DOM tree, appending children to it does not cause page reflow (computation of element's position and geometry). The only way to protect the cookie is by using a different Document& scroll event These two things actually mean the same. The complete document is searched, including the root node. ID Document.querySelector() . You may also call getElementsByClassName() on any element; it will return only elements which are descendants Document.forms loading. The load event is fired when the whole page has loaded, including all dependent resources such as stylesheets and images. Document& DOMContentLoaded event Document querySelector() Element null load (en-US) Document.readyState Instead, it is recommended to throttle the event using requestAnimationFrame(), setTimeout(), or a CustomEvent, as follows.. Document If a site sets document.domain, any other customer on a different subdomain can now do the same thing, and start accessing the data of the original site. Document In the DOM tree, the document fragment is replaced by all its children. Historically, using document fragments could result in better performance. Document.cookie The complete document is searched, including the root node. Document.readyState Document querySelector() Element null readyState . Since scroll events can fire at a high rate, the event handler shouldn't execute computationally expensive operations such as DOM modifications. images) also has been loaded.. Document When called on the document object, the complete document is searched, including the root node. interactive. Document.documentElement The event doesn't include the document's updated visibility status, but you can get that information from the document's visibilityState property.. HTML designMode document execCommand contentEditable . Fired when the readyState attribute of a document has changed. The load event is fired when the whole page has loaded, including all dependent resources such as stylesheets and images. web-vitals In some cases, this method can affect the state of the HTML parser while the parser is running, resulting in a DOM that does not correspond to the source of the document (e.g. Document.domain You can call Window.getSelection(), which works identically to Document.getSelection().. document.readyState becomes complete when all resources (iframe and img) are loaded. The document has finished loading and the document has been parsed but sub-resources such as scripts, images, stylesheets and frames are still loading. loading. It is worth noting that currently getSelection() doesn't work on the content of elements in Firefox. Even though some of the supported browsers have native userscript support, Tampermonkey will give you much more convenience in managing your userscripts. You may also call getElementsByClassName() on any element; it will return only elements which are descendants Document readystatechange. It can be easily bypassed using the DOM, for example by creating a hidden