Widget: page title
Please take a look on the 4 green buttons.
And hover with your mouse pointer over these buttons.
1st button (cog): does not have any mouse title
2nd button (visualization): has a mouse title on the tiny image, but does not have a title on the gray background around the image
3rd button (export): title will shown on the gray background and on the image (that is fine as expected)
4th button (search: title will shown on the gray background and on the image (that is fine as expected)
Let's take a look into HTML
same behaviour like 3rd and 4th button
1st, 2nd and (3rd, 4th) buttons have different title behaviours
Dashboard, page title widget
When I expand the report: