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LibHTML: Add Comment and CharacterData nodes and improve HTML parsing
This patch adds the CharacterData subclass of Node, which is now the parent class of Text and a new Comment class. A Comment node is one of these in HTML: <!--hello friends--> Since these occur somewhat frequently on the web, we need to be able to parse them. This patch also adds a child rejection mechanism to the DOM tree. Nodes can now override is_child_allowed(Node) and return false if they don't want a particular Node to become a child of theirs. This is used to prevent Document from taking on unwanted children.
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<!DOCTYPE html>
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<html>
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<head>
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<title>Welcome!</title>
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<!-- this is a comment -->
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<style type="text/css">
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body {
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background-color: #fff;
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