Is Checked Checked Valid With Html5

HTML Programming

As an HTML developer, I’ve often found myself wondering about the validity of the “checked” attribute in HTML5. The “checked” attribute is commonly used in input elements, especially with checkboxes and radio buttons. It determines whether a checkbox or radio button should be checked by default. But is this attribute actually valid in HTML5? Let’s dive deep into this topic to understand more about its usage and validity.

Understanding the “checked” Attribute

The “checked” attribute is a boolean attribute. When present, it specifies that an input element should be pre-selected when the page loads. This is commonly used with checkboxes and radio buttons to have a default selection when the page is loaded.

HTML5’s Approach to Boolean Attributes

In HTML5, boolean attributes like “checked” can be defined without a value. For example, in traditional HTML, you might have seen the “checked” attribute defined like this: <input type="checkbox" checked="checked">.

However, in HTML5, the presence of the attribute alone is enough to represent a true value. So, the “checked” attribute can simply be written as: <input type="checkbox" checked>.

HTML5 Validation for the “checked” Attribute

HTML5 validation allows the use of the “checked” attribute without a value, as mentioned earlier. This is considered valid and is widely supported across modern browsers and HTML5 validators.

Understanding Best Practices

While the “checked” attribute is valid in HTML5, it’s essential to use it responsibly and adhere to best practices. Ensure that the “checked” attribute is used only where pre-selection is necessary and makes sense from a user experience standpoint.

Personal Commentary

From my experience, the “checked” attribute has been a handy tool for setting default selections in forms. Its validity in HTML5 reassures me that I can continue using it without worrying about compatibility issues or validation errors. However, it’s crucial to apply it judiciously to enhance the usability of web forms.


After delving into the details, it’s evident that the “checked” attribute is valid in HTML5 and plays a crucial role in setting default selections for checkboxes and radio buttons. Embracing it within the realms of best practices can greatly improve the user experience on web forms.