When implementing a dialog, it is important to consider the most appropriate place to set user focus. If creating a custom dialog implementation, ensure all expected default behaviors are supported and proper labeling recommendations are followed. The native HTML element should be used in creating modal dialogs as it provides usability and accessibility features that must be replicated if using other elements for a similar purpose. Allowing cross-origin use of images and canvas.HTML table advanced features and accessibility. From object to iframe - other embedding technologies.Assessment: Structuring a page of content.
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