How can you make the entire text in an HTML text input automatically selected upon clicking?

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You can use JavaScript to automatically select the text in an HTML text input upon clicking. Here's an example:

<input type="text" value="Click to select all" onclick="this.select();" />

In this example, the onclick event calls a JavaScript function that selects all the text in the input using the select() method. This means that when the user clicks on the input, it will automatically select all of the text inside.

Note: This may not work on all devices, as different browsers may have different behavior with regards to automatic selection of input text.