How to parse html documents? Detailed explanation of the parsing process

What this article brings to you is how to parse HTML documents? The detailed explanation of the analysis process has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

##General process:

Parse html file-> Build dom tree-> Build render tree-> Layout render tree-> Draw render Tree

1. Generation of dom tree;

2. Parse css to build cssom tree (CSS object model);

3. Build render based on dom tree and cssom tree Tree (rendering tree);

4. Layout according to the rendering tree to calculate the geometric information (position, size, etc.) of each node.

5. Draw each node to the screen.

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