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Showing content from https://webplatform.github.io/docs/dom/HTMLInputElement/defaultChecked below:

defaultChecked Summary

Gets whether the checked HTML attribute is present on the element.

Syntax

Note: This property is read-only.

var initiallyChecked = checkboxElement.defaultChecked;

Return Value

Returns an object of type BooleanBoolean

Whether the checked HTML attribute is present on the element.

Notes

This property reflects the value of the checked HTML attribute.
This property can be changed programmatically, however, doing so has no effect on the appearance of the check box or radio button or on how forms are submitted - if the checked property has been changed by a user or by a script.

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