Sobre esta regra de acessibilidade
Ensures that input buttons have legible text.
Without an accessible name, screen reader users cannot determine the purpose of a input type="button".
Without a discernible and accessible name, screen reader users cannot grasp the purpose of an image. A title for a photograph may just convey advisory information about the image. When used as a control, unnamed actionable visual images such as buttons have no clear definition of the destination, purpose, function, or action for the non-text material.
What this Accessibility Rule Checks
The text on input buttons must be readable.
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