Prefixed Fullscreen API is deprecated. Please use unprefixed API for fullscreen. For more help https://developer.mozilla.org/en-US/docs/Web/API/Fullscreen_API
Mae'r API Prefixed Fullscreen yn anghymeradwy. Defnyddiwch API heb ei ragosod ar gyfer y sgrin llawn. Am gymorth pellach: https://developer.mozilla.org/en-US/docs/Web/API/Fullscreen_API