[7.x] [Graph] Fix various a11y issues (#54097)#54552

Merged

flash1293 merged 1 commit intoelastic:7.xfrom flash1293:backport/7.x/pr-54097

Jan 13, 2020

+113-40

Commits on Jan 13, 2020

[Graph] Fix various a11y issues (elastic#54097 )
flash1293
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