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What is the syntax of an HTML checkbox?

The syntax of an HTML checkbox is usually the checkbox (´╗┐<´╗┐input>) associated with a clickable label ´╗┐<´╗┐label>:

<input type="checkbox" id="johndoe" name="john" value="1">
<label for="johndoe"> John Doe</label><br>

The above code displays the following checkbox: