11/20/2023 0 Comments Dom cycle parts![]() This is why when loading external javascript file, the parsing of the main HTML page is suspended. Javascript may look multi-threaded, but the fact is that Javascript is single threaded. The execution is top down and single threaded. Lastly, it will make another call to the CSS thread to apply the CSS style to this particular element. Secondly, the parser will call to bind the onclick event to this particular element. Firstly, the parser will create this element and register it in the DOM namespace, together with all the attributes related to this element. The parser will make 3 calls, two to Javascript and one to CSS. Internal CSS rules are parsed and defined.The parsing of the HTML document starts.Roughly the execution flow is about as follows: If you are interested in detailed coverage on the load and execution of a web page and how the browser works, you should check out (open sourced at ) And it shows as the following image:Įdit: It's 2022. I did an experiment in Firefox with Firebug. Then the DOM will be changed corresponding to the user's behaviors depending on the JS.Ĭan anyone give a detailed explanation about what happens when you've got the response of a html page? Does this vary in different browsers? Any reference about this question? After the html is loaded, the browser starts to load the external resources in the structure in parallel and execute, until all resources are loaded. The browser parses the html (DOM) and gets the external resources in an array or stack-like structure. ![]()
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