Text boxes and watermarks
Screen readers and other assistive technology cannot access information in text boxes or watermarks. Therefore, vital information (such as Respond by X Date, CONFIDENTIAL, or Do Not Distribute) must also be duplicated at or near the start of the main content area.
Unless there’s a compelling business need, flashing objects should be excluded. If you feel you do have a compelling business need, ensure your object flashes below 3Hz.