wiki:Component Model

Version 15 (modified by Dimitri Glazkov, 9 years ago) (diff)

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Component Model in WebKit

The component model effort brings encapsulation to the Web. See use cases for more background. Ping dglazkov, dominicc, morrita, or rolansteiner on #webkit for more information.

Implementation Status

If this is older than 30 days, it's probably out of date.

Area Status Comments
Convert all existing shadow DOM to new model input/textarea remain
Shadow Content Plumbing Basic plumbing in place
DOM Interfaces Not yet implemented Waiting on the plumbing to settle down
Declarative API (Markup) Not yet implemented Waiting on the plumbing to settle down
Events Functionally complete
Lifecycle Not yet implemented Built-in HTML elements implementation uses direct wiring
Document/Resource Loading Not yet implemented
CSS matching Some of the selectors and shadow scopes implemented
Testing Some layout tests Need to grow this to a full-featured test suite, preferably also a conformance suite

Current differences from the XBL2 spec:

  • Shadow root element Instead of it being a <template> element clone, we use a different node type (SHADOW_ROOT_NODE = 14) for the root node.
  • Event retargeting We don't create a separate Event object for each re-targeting, because we don't worry about component isolation (yet).
  • pseudo attribute Same as XBL2 pseudo, but allows arbitrary value and CSS machinery has been modified to allow any value.
  • Tree scopes Matches the shadow scope notion of in XBL2, but is a more explicit abstraction.
  • Inheritance Won't be implementing. This feature is overly complex and unnecessary for the component model. See this post to public-webapps.
  • Content element Need to better understand requirements and use cases to spec/implement properly. Certainly won't be implementing the way it's defined in XBL 2.0.