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Accessibility/MathML: Difference between revisions
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Added comparison to WebKit.
(Added list of potentially interesting attributes to expose.) |
(Added comparison to WebKit.) |
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| Line 751: | Line 751: | ||
* MATHML_STACK_CARRY | * MATHML_STACK_CARRY | ||
* MATHML_STACK_LINE | * MATHML_STACK_LINE | ||
==Comparison with WebKit== | |||
There's a decent mapping between the proposed interface and how WebKit currently implements MathML accessibility. | |||
As an example, the <msup> element will be used. | |||
<pre> | |||
<math> | |||
<msup> | |||
<mi>x</mi> | |||
<mn>2</mn> | |||
</msup> | |||
</math> | |||
</pre> | |||
MathML elements are of AXRole AXGroup. In order to determine the type of MathML element, the AXSubrole is checked. The <msup> element has an AXSubrole of AXMathSubscriptSuperscript. | |||
In order to determine the type of MathML element it is (<msup>, <msub>, or <msubsup>), there are the following three attributes that are added: | |||
* AXMathBase | |||
* AXMathSubscript | |||
* AXMathSuperscript | |||
These attributes point to the element fulfilling each particular role, and have a nil value otherwise. | |||
In this case, since it's a superscript element, AXMathBase points to the <mi> and AXMathSuperscript points to the <mn>. AXMathSubscript has a nil value. | |||
On the <mi> and <mn> elements, no additional information regarding MathML structure is given, apart from knowing that the sub-roles are AXMathIdentifier and AXMathNumber respectively. | |||
This is an advantage of the proposed interface, as it provides a way for child elements to know what part in their parent structure they are. | |||
<mi> would know it's the base, and <mn> would know it's the superscript in this case. | |||
With regards to mapping the proposed interface back to a WebKit compatible format, the existing AccessibleWrap and RoleMap can be modified so that the same interface is provided on OS X. | |||
Additional information will also be available in the proposed interface (AXMathBaseOf or similar for the above example). | |||