Slider Extender: new TooltipText property and Accessibility
In the latest version of the Ajax Control Toolkit, the Slider comes with a new property called TooltipText.
The TooltipText property can be set to a string that is displayed when we hover over the slider's handle. If the string contains the placeholder {0}, it will be replaced by the current value of the slider. For example, the slider in the below screenshot has the TooltipText property set to "Slider: value {0}. Please slide to change value".
Due to accessibility requirements, the Slider now always uses a img element to display the handle. This, combined with the TooltipText property, allows to obtain more accessible sliders. Below is a screenshot done in high contrast mode.
Note how the slider in the figure has borders around the rail. At the moment, if you like to add borders, you should add them to a parent element rather than to the extended TextBox.