HTML Input Attributes - W3Schools
https://www.w3schools.com:443/html/html_form_attributes.asp
WEBThe step Attribute. The input step attribute specifies the legal number intervals for an input field.. Example: if step="3", legal numbers could be -3, 0, 3, 6, etc. Tip: This attribute can be used together with the max and min attributes to create a range of legal values. The step attribute works with the following input types: number, range, date, datetime-local, month, …
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