The Tangled Web (Web-trapped) Fourth Chapter summary

1. HTML syntax:

The tag is a hierarchical structure, and the label is considered a name, and the value is inserted.

Key components: <,;, ', ', &

2. Parsing mode:

File Start <! Doctype> informed,

But can also be transmitted by Content-type,

For key characters in 1, the <! can be [cdata[...] > Packaging

3. Parser Behavior:

Very high tolerance for errors, spaces, special characters, HTML filter design sometimes can not only consider a layer two layer,

And the multiplicity of labels,

Standard inconsistencies across browsers

4. Entity code:

& Symbol at the beginning, end of symbol, ASCII, Unicode, (& #开头),

5. Hyperlinks and content include:

<a href= "url" >

The action of the form is essentially an HREF

6. Other resources:

Picture (); style sheet (<link rel=stylesheet href=...> or <style src=...>)

Client script (<script> including individual flower scripts)

Plugins (<embed>, <object> ...)

7. Cross-Domain requests

The browser is a transparent containing global identity information, so when the state changes the request sent to the server, it is impossible to confirm whether the customer or a third party sent.

Solution: Include a drawing-related encryption parameter in the request so that the third party cannot get it. (same-Origin policy read restrictions on cross-domain documents)

　　

The Tangled Web (Web-trapped) Fourth Chapter summary