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The HTML Constraint Validation API provides default error messages. For example, when the user enters an invalid pattern, the message below is automatically provided:

Please match the requested format.

These messages are useful because they're translated into the locale language of the user.

Can these default validation messages be accessed using client side JavaScript?

Sources:

I've read the sources listed in my original post, and cannot find a way to access these messages.

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    I haven't seen a way to do it. Since the browser already does the localization for you, what do you need to do with it? Commented Jan 16, 2023 at 23:28
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    Thanks @Barmar. My goal is to implement custom pattern functionality, but display the default pattern error message (same for required, etc). The answer may be to simply create invalid inputs using JS, then take the validationMessage text from them. Commented Jan 17, 2023 at 2:33
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