REQUIRE A VALUE IN AN INPUT FIELD
You can use the new required input attribute to force the user to supply a value in any input field. Supported web browsers will pop up a simple message saying that the field is required if the user attempts to submit a blank value:
<input ... required>
The required attribute, when applied to an input element, activates the require-input feature in the user’s web browser, if supported.
One unfortunate problem with the require-input feature is that if multiple fields are required and missing a value, only the first one will receive the pop-up notification error. The user will need to correct the first problem and submit the form again before being notified of the second error.
To sidestep this issue, simply ...
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