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How to allow only numbers and decimal points in an HTML input element?

How can you make an HTML input element that allows only numbers and amounts to be entered? Are you collecting amounts on your web page such as prices ($12.34), distances (1.5 miles) or lengths (22.3 cm), temperature (70.4 C) or duration (19.72 seconds)? Do you need to make your input element reject all characters except […]