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The CSS handler takes care of the conversion of textual specification
of a CSS stylesheet to an internal datastructure provided by
lib-dom.
It takes incoming textual data from the following sources:
- It listens to
msg_dom_create_event messages. When
the associated document has a document type for which a default
stylesheet is known, namely one of the HTML versions, the
CSS handler starts to monitor this document.
- It listens to
msg_dom_mutation_event messages for
HTML documents. Whenever a <STYLE> node is
created, the CSS handler will add the information in its children
to the current stylesheet.
- It also scans
style attributes for HTML documents
on newly created nodes.
- It also listens to all other
msg_dom_mutation_event
messages, for DOM trees which do not have a known document type. This
is done in order to keep track of
processing instructions.
When a link to an external stylesheet is encountered, like with the
XML processing instruction. The CSS handler will request this document,
listen to the incoming textual data and merge it with the style
information already present.
The stylesheet information can be obtained from the
CSSStyleSheet objects created by the CSS handler. These
are announced using msg_css_create_event messages.
The CSSStyleSheet object contains methods to determine
the specified and computed style of any element in the associated
DOM tree.
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