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html - How to limit the textarea to only hold numbers?

I'm trying to make a date textbox on my blog, and the date is only numbers. I don't want anybody making a mistake typing a letter. Is there any way to limit the characters to only numerals? Thanks!

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Use HTML5 input number type instead and leverage native browser validation. Thus, no JavaScript required.

<input type="number" />

It has wide support in browsers and it's the standard and best-practice solution.

Also on mobile and tablets the numeric key pad will appear instead.

See demo


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