Huong Nguyen ef8420e5a3 MDL-74822 usertours: Fix accessibility issues with user tours
Including in this commit:
 - Prevent the tour to be displayed if the CSS is disabled by the browser
 - Removed redundant tabindex=0 attribute on the target
 - Created extra code to re-calculate the suitable position of the tour
 - Fixed tour issue in 200% and 400% zoom
 - Fixed tour highlight is not correct in 200% and 400%
2023-01-03 10:34:48 +07:00
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