In HTML, the `viewpoint` is the area of the webpage that is visible to the user. It is determined by the size and shape of the browser window, as well as the zoom level and the position of the scrollbar.
The `viewpoint` can be controlled using the `viewport` meta tag, which is placed in the `<head>` of the HTML document. The `viewport` meta tag allows you to specify the width, height, and initial scale of the webpage, as well as other properties such as whether or not the user can zoom in or out.
Here's an example of how to use the `viewport` meta tag to set the initial scale of the webpage to 1:
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<!-- content goes here -->
</body>
</html>
The `viewport` meta tag is particularly useful for responsive web design, as it allows you to control how the webpage is displayed on different devices with varying screen sizes and resolutions. By setting the `width` to `device-width` and the `initial-scale` to 1, you can ensure that the webpage is displayed at a 1:1 scale on all devices.
It's important to note that the `viewport` meta tag is only supported by modern browsers, and may not work on older browsers or devices.
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