Tooltips and semantic colors are important aspects in apps. They have to be interpreted correctly by the screen reader and require some special ARIA labeling.
Currently tooltips have to be disabled for all controls. An exception is made for images (stand-alone or as part of controls, such as buttons with icons/images but without text on the button itself).
An editable color scheme and possibility of color modification
Navigable using the keyboard
The screen reader information must be available at the focus points (axis values, dialog info, legend)
You should hide image controls or controls with background CSS images used for pure decoration purposes by using the aria-hidden=“true” property.