If you have any images or icons in your signature, you should add Alt Text to them by right-clicking on the object and going to Picture > Alt Text.
Os oes unrhyw ddelweddau neu eiconau yn eich llofnod, dylech ychwanegu Testun Amgen atynt drwy dde-glicio ar y gwrthrych a mynd i Llun > Testun Amgen.