Documentation:
Accessibility Attributes

Here you can enable the tabindex="0" attribute on selected elements. This attribute will allow elements to receive keyboard focus in the order that they appear in the document.

A) Enable

Here you can enable the tabindex="0" attribute on the selected elements.

B) Add To

Here you can enter a comma-separated list of selectors for website elements that you wish to add the tabindex="0" attribute to.

B) Remove From

Here you can enter a comma-separated list of selectors for website elements that you wish to remove the tabindex="0" attribute from.

For detailed information on the tabindex="0" attribute and its uses, please see here.