In the <video> element code provided, what attribute prevents the first frame of the video from displaying while loading?

The attribute that prevents the first frame of the video from displaying while loading is the poster attribute. When a video is embedded using the

Using the poster attribute helps to enhance the user experience by providing context about the content of the video before it plays, making it more engaging and informative. In cases where no poster is provided, the initial frame of the video may show up if the user attempts to play it without the video being fully buffered. Thus, it effectively avoids that issue by allowing a custom static image until the video is actively played.