What level is WCAG 1.4.13?

Level AA. It sits under guideline 1.4 Distinguishable of the Perceivable principle.

What are common ways pages fail WCAG 1.4.13?

Tooltips disappear the moment the cursor leaves the trigger, even if the user is moving toward the tooltip. Popovers can't be dismissed with Escape.

How do I fix WCAG 1.4.13 issues?

Allow Escape to dismiss the popover. Keep the popover visible while the pointer is over it. Don't auto-dismiss on a timer.

1.4 Distinguishable · Perceivable

WCAG 1.4.13 Content on Hover or Focus

Level AA

When extra content (tooltips, popovers) appears on hover or focus, the user must be able to dismiss it, hover the new content, and have it persist until they move away or dismiss it.

Common failures

Tooltips disappear the moment the cursor leaves the trigger, even if the user is moving toward the tooltip.
Popovers can't be dismissed with Escape.

How to fix

Allow Escape to dismiss the popover.
Keep the popover visible while the pointer is over it.
Don't auto-dismiss on a timer.

Related criteria

WCAG 2.1.1 Keyboard Level A
WCAG 2.4.7 Focus Visible Level AA