HTML5: How to specify one or more forms the output element belongs to?

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HTML Code:

<!DOCTYPE html>
<meta charset="utf-8"><!-- Specifies the character encoding for the document -->
<title>How to specify one or more forms the output element belongs to</title><!-- Title of the HTML document -->
<form oninput="second_output.value=parseInt(a.value)+parseInt(b.value)" id="MyForm"><!-- Form element with oninput attribute triggering calculation -->
<input type="range" name="b" value="50" /> + <!-- Range input field with default value 50 -->
<input type="number" name="a" value="10" /> = <!-- Number input field with default value 10 -->
<output form="MyForm" name="second_output" for="x y"></output><!-- Output field displaying the result, associated with form "MyForm" -->


  • This HTML code demonstrates how to specify one or more forms that an <output> element belongs to.
  • Here's the breakdown:
  • The document starts with the declaration of the document type and contains various elements.
  • The form with the ID MyForm contains two input elements: a range input and a number input.
  • JavaScript code within the oninput attribute of the form calculates the sum of the values entered into the input fields (after parsing them as integers).
  • The parseInt() function is used to convert the input values from strings to integers for proper addition.
  • The <input> elements are associated with the form MyForm through their respective name attributes.
  • The <output> element with the name second_output is associated with the form MyForm using the form attribute.

Live Demo:

See the Pen output-form-answer by w3resource (@w3resource) on CodePen.

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