To control the appearance of <video> tags in HTML, the core method is to use HTML attributes with CSS styles. 1. Use built-in properties such as controls, autoplay, loop, muted and poster to achieve basic functional control; 2. Adjust the size, borders, shadows and responsive layout of the video player through CSS to match the website design style; 3. If you need to fully customize the interface, you can remove the default controls and build the UI components yourself; 4. Use responsive design techniques to ensure that the video is displayed well on different devices, such as setting containers with an aspect ratio of 16:9 to avoid deformation.

When you want to control the appearance of <video></video> HTML tags, it's mostly about combining HTML attributes with CSS styling. The default look of a video player can vary across browsers, so if you're aiming for consistency or a custom design, you'll need to do more than just use the basic tag.

Use Built-in Attributes for Basic Control

The <video></video> tag comes with several built-in attributes that let you control playback and display without any extra code:

• controls – adds the browser's default play, pause, volume, and timeline controls
• autoplay – starts playing the video automatically (may be blocked by browsers)
• loop – makes the video replay when it ends
• muted – starts the video with no sound
• poster – sets an image to show before the video plays

These are helpful for quick setups, especially if you don't need a custom look. But keep in mind, they won't change the visual style — just functionality.

Customize Appearance with CSS

To make your video blend into your site's design, you'll need to apply CSS. You can adjust size, borders, shadows, and even responsiveness:

 .video-wrapper {
  max-width: 100%;
  margin: auto;
  border: 2px solid #ccc;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

You can wrap your video in a container and target the <video> element directly too:

 <div class="video-wrapper">
  <video src="myvideo.mp4" class="custom-video" controls></video>
</div>

Then style it:

 .custom-video {
  width: 100%;
  height: auto;
  border-radius: 8px;
}

If you want to hide the default controls and build your own UI (like buttons), you'll remove the controls attribute and add your own buttons with JavaScript event handlers for play/pause, volume, etc.

Responsive Design Tips

Videos should resize nicely on different screen sizes. A few tips to ensure that:

• Set width: 100% and height: auto so it scales within its container
• Wrap videos in a div with padding-bottom trick for maintaining aspect ratio
• Use media queries to tweak layout at different breakpoints

Here's a common way to maintain a 16:9 aspect ratio:

 <div class="video-container">
  <video src="myvideo.mp4" controls></video>
</div>

With this CSS:

 .video-container {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 */
  overflow: hidden;
}

.video-container video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

This keeps the video looking good on mobile and desktop without distortion.

Basically that's it. Whether you're tweaking small details or building a full custom player, combining HTML attributes and CSS gives you solid control over how your video appears to users.

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