1) After opening a tooltip, hitting tab will not focus on the close icon if there is another focusable item in the DOM below the tooltip trigger.

Reproduction Steps:

• Open the https://www.telerik.com/kendo-angular-ui/components/tooltip/closable-tooltip/ example in stackblitz
• Add a plain button (or any focusable item) underneath the tooltip component
• Focus on the tooltip button with the keyboard
• Open the tooltip by pressing "Enter"
• Hit tab
• The focus goes to the next button rather than into the tooltip

This is an issue for keyboard users because they cannot easily tab into the tooltip to close it

2) When opening or tabbing into the tooltip, the screen reader (Voice Over, NVDA) doesn't read the tooltips content