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HTML specifies whether or not a tag supports the ARIA "role" attribute. If the "role" attribute is supported by the tag, the spec also says which values of "role" the tag supports (and some tags support all possible roles). For example, <ul> can have any of the following roles: directory, group, list, listbox, menu, menubar, presentation, radiogroup, tablist, toolbar, tree. Another example: <button> can have role=button, link, menuitem, menuitemcheckbox, menuitemradio, or radio. It would be really cool and useful if this relationship was encoded in the HTML content assist.
Closing as part of a mass clean up of inactive bugs. Please reopen if this problem still occurs or is relevant to you. For more details see: https://dev.eclipse.org/mhonarc/lists/orion-dev/msg04002.html
This is even more relevant now that authoring tools are being called out in section 508: http://www-03.ibm.com/able/guidelines/ci162/accessibility_checklist.html#authoring
See also bug 484254 (similar, but not the same).
