Test case: `<desc>` + `aria-describedby`

According to the SVG Accessibility API Mappings (AAM), the <desc> element should provide the accessible description for its parent element. This test case uses the aria-describedby attribute to associate the <desc> element with its parent.

Test example

Test criteria

The browser should use the <desc> element as the accessible description for the <svg> element, based on the accessible name and description computation.
The screen reader should announce the content of the <desc> element as the accessible description for the <svg> element.

Test results

Browser test results
	Chrome 46 (IA2)	Edge Win10.1024 (UIA)	Firefox 42 (IA2)	IE 11 (MSAA)	Safari 9 (NSAP)
`<desc>` + `aria-describedby`	Fail `<desc>` exposed as accessible name	Fail UIA_describedby property is null	Fail `<desc>` exposed as accessible name	Pass	?

Screen reader test results
	Chrome 46	Edge Win10.1024	Firefox 42	IE 11	Safari 9
Jaws 17	Partial Jaws announces `<desc>` as accessible name	Fail Jaws announces "graphic"	Fail SVG not recognised	Pass	N/A
Narrator Win10.1024	N/A	Fail Narrator announces "graphic"	?	?	?
NVDA 2015.4	Pass	Fail NVDA announces "image"	Fail SVG not recognised	Pass	?
Orca ?	N/A	N/A	?	N/A	N/A
VoiceOver OSX10.11	?	N/A	?	N/A	?