Explanation
The Accessibility checker classifies each issue as an error, a warning, or a tip based the issue's severity.
Issues include:
* Focus isn't showing
When the FocusBorderThickness of a control is set to 0. It is good practice to ensure a proper color-contrast ratio between the focus border and the control itself so it's clearly visible.
Reference:
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/accessibility-checker