Top layer - MDN Web Docs Glossary: Definitions of Web-related
![Top layer - MDN Web Docs Glossary: Definitions of Web-related](https://developer.mozilla.org/en-US/docs/Glossary/Top_layer/top_layer_devtools.png)
The top layer is a specific layer that spans the entire width and height of the viewport and sits on top of all other layers displayed in a web document. It is created by the browser to contain elements that should appear on top of all other content on the page.
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