RenderingContext? | - getContext(DOMString contextId, any arguments...)
- The getContext(contextId, arguments...) method of the canvas element, when invoked,
must run the steps in the cell of the following table whose column header describes the
canvas element's canvas context mode
and whose row header describes the method's first argument.
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boolean | - probablySupportsContext(DOMString contextId, any arguments...)
- The probablySupportsContext(contextId,
arguments...) method of the canvas element, when
invoked, must return false if calling getContext() on
the same object and with the same arguments would definitely return null at this time, and true
otherwise.
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