Event Transparency API
Event Transparency API Support
At the recent OpenAjax F2F meeting, Alex Russell said that the critical feature is to pass events down to elements underneath from a top/down visual perspective, and not necessary to attempt more complicated solutions.
Why Is This Important?
One example is a popup dialog with drop shadow. The drop shadow is only for visual decorations. Events happen within this drop shadow are supposed to be processed by the dialog itself.
Another example is drag-and-drop. When implementing drag-and-drop, developers need to display visual helpers such as drag shadow, drop target gesture, and drag source gesture. Such visual helpers are not intended for event processing, which should be processed by the actual drag source and drop target objects. In implementations, Ajax libraries have to calculate the locations of all drop targets to enable dragging of the source with offset, resulting expensive hit box calculations.
Background material that request this feature
Jon Ferraiolo's comments
If the browsers implement SVG faithfully, they have to implement its 'pointer-events' property (http://www.w3.org/TR/SVG11/interact.html#PointerEventsProperty). This property has some of the semantics that Ajax toolkits require, particularly the notion that events can be passed through objects that are "above" (in the z-order sense) to other objects that lie "below" (in the z-order sense). I'm not sure how well this property maps onto HTML, or addresses the requirement above, but this SVG property perhaps would be informative to the people working at enhancing HTML to address this requirements.
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Phase II Voting
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