To help Tanya insert a video with all its controls into her web page, she should use the HTML `` element and ensure the attributes and tags are correctly formatted. Here is the correct code she needs:
```html
Your browser does not support the video tag.
```
Here is a breakdown of each part of the code:
1. ``: This line defines the video element with the specified dimensions and includes the `controls` attribute, which adds playback controls like play, pause, volume, etc.
2. ``: This line specifies the source file for the video and its type. The `src` attribute includes the file name and path, and the `type` attribute specifies the video format.
3. `Your browser does not support the video tag.`: This message will display if the browser does not support the video tag.
4. ``: This tag closes the video element.
By using this code, Tanya will ensure that her video is embedded correctly with all the necessary controls and specified dimensions.