How Does a Web Browser Load and Execute a Web Page\'s Contents?-JS Tutorial-php.cn

Blocking: If an external script is marked with defer or async, the browser downloads it and executes it before continuing to parse the HTML.
Non-Blocking: If an external script is marked with load, the browser downloads it and executes it asynchronously, without blocking the HTML parsing.

How Does a Web Browser Load and Execute a Web Page's Contents?

Load and Execution Sequence of a Web Page

Overview

When a web page is requested, the browser performs a series of tasks to load and execute its contents. This involves processing the HTML document, fetching and executing external resources, and rendering the page.

Sequence of Loading

HTML Document: The browser downloads the HTML document and begins parsing it.
Inline Resources (Scripts and Styles): As the browser encounters inline
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