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[CssSelector] added a node about HTML extension in readme #8287

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[CssSelector] added a node about HTML extension in readme #8287

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22 changes: 22 additions & 0 deletions src/Symfony/Component/CssSelector/README.md
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Expand Up @@ -10,6 +10,28 @@ equivalents:

print CssSelector::toXPath('div.item > h4 > a');

HTML and XML are different
--------------------------

- The `CssSelector` component comes with an `HTML` extension which is enabled by default.
- If you need to use this component with `XML` documents, you have to disable `HTML` extension.
- `HTML` tag & attribute names are always lower-cased, with `XML` they are case-sensistive.

Disable & enable `HTML` extension:

// disable `HTML` extension:
CssSelector::disableHtmlExtension();
// re-enable `HTML` extension:
CssSelector::enableHtmlExtension();

What brings `HTML` extension?
- Tag names are lower-cased
- Attribute names are lower-cased
- Adds following pseudo-classes:
- `checked`, `link`, `disabled`, `enabled`, `selected`: used with form tags
- `invalid`, `hover`, `visited`: always select nothing
- Adds `lang()` function

Resources
---------

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