CSS :read-write Pseudo-Class

The :read-write pseudo-class in CSS is used to select elements that are editable, meaning they can receive user input. This is most commonly applied to form elements such as <input> and <textarea> elements. The elements with the :read-write state allow users to modify their contents, whereas elements in the :read-only state do not.

Here’s how you can define styles for elements that are editable using the :read-write pseudo-class:

input:read-write {
    background-color: #f9f9f9;
    border: 1px solid #ccc;
}

textarea:read-write {
    background-color: #f0f8ff;
    border: 1px solid #007bff;
}

In the example above, when the user clicks into the <input> field labeled "Username" or the <textarea> for "Comments", they will have the ability to type and change the text. The styles defined with :read-write should apply, giving a visual indication that these fields are editable. Once they become focused and user input is available, they will have the specified styles:

Now, let’s also add styles for the :read-only state. This can be useful when you want to indicate that specific fields cannot be edited:

input:read-only {
    background-color: #e9ecef;
    border: 1px solid #6c757d;
}

textarea:read-only {
    background-color: #e9ecef;
    border: 1px solid #6c757d;
}

In this second example, the fields are marked as readonly, so they do not allow the user to edit. As a result, the defined styles for :read-only apply to indicate that these fields are not editable.

With these examples, you can see how to effectively use the :read-write and :read-only pseudo-classes to style your editable and non-editable form elements.