Jfrench showhide modified to meet accessibility standards#72

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jefrench wants to merge 10 commits intomasterfrom

jfrench_showhide

Commits on Dec 21, 2020

add a space to the script for the edxshowhide environment in main.py so that it works on mobile devices and with the edX new experience
jefrench
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Commits on May 4, 2021

modifications to make showhide accessible to screen readers
jefrench
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modify h4 in showhide to have aria-expanded: false so that it is seen by screen readers
jefrench
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fix location of caret with respect to text of h4 element
jefrench
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Commits on May 5, 2021

replace h4 in showhide with button and add tabindex for better screen reader accessibility
jefrench
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Commits on May 12, 2021

fix hover focus and active tags and replace arrow with hideshowarrow
jefrench
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Commits on May 13, 2021

Commits on May 17, 2021

more beautiful
jefrench
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