Jun Pataleta b9fd956e73
MDL-79061 course: Create a sr-only mutations logger
* Create SRLogger that extends from the default Logger class. This
logger outputs the feedback to a sr-only ARIA live region to allow
screen readers to announce the feedback from mutations.
* Update the course editor to use the SRLogger.
2023-12-06 11:54:11 +08:00
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