Tag: domcontentloaded

How can I detect the moment a specific DOM node has been downloaded by the browser, while the page is still loading?

I am writing a user script which needs to access specific DOM nodes on the page. To reduce latency and page re-layouting, I want to set it to // @run-at document-start instead of the usual // @run-at document-end, and run my code as soon as the DOM node I need has been downloaded from the server. If I just wait

Why DOMContentLoaded handler can block first paint?

dom domcontentloaded javascript

There is a similar question that wasn’t resolved. I’ve encountered a situation when handler that listens to DOMContentLoaded can block first paint. Sometimes it blocks, sometimes it doesn’t I tried many times cmd + R to see it. Is there any explanation to this behaviuor? Also I recordered a video to show this: https://www.youtube.com/watch?v=EDZQ1nLCK2w&feature=youtu.be When you see a blank page

Declare global constants in function javascript on DOMContentLoaded

constants domcontentloaded ecmascript-6 javascript scope

Is there any way to declare constants when the DOMContentLoaded event triggers, that are accessible outside? Answer If the question is: “Is there any way to declare a constant variable without a value, and assign one to it later?”, then the answer is no. Think of it again: after the declaration, a constant variable’s value must always be the same;