In CSS, validators are powerful tools that help us apply specific styles to specific elements on a page. One of these validators is :user-valid, which is used when we want to control forms. This validator is quite common for user authentication and input validation. When a user enters valid information, this validator gets activated.
This validator particularly applies to user forms, such as input emails, passwords, etc. Imagine a form where the user needs to input their email. When the user enters a valid email, we can apply specific styles using :user-valid to change, for example, the background color to indicate that the input is valid.
Using the :user-valid validator can enhance the user experience since the user can immediately recognize whether the entered data is valid or not. In the following example, we have a code snippet related to the use of :user-valid.
<style>
input:user-valid {
border-color: green;
background-color: #ccffcc;
}
</style>
<form>
<label for="email">Your email:</label>
<input type="email" id="email" name="email" required>
</form>
In this example, we have an email field that styles only when the user enters a valid email, demonstrating style modifications. Let's break down some of the code:
<style> This tag defines CSS styles.
input:user-valid { This part specifies the style for an input element when the validation criteria are met.
border-color: green; This line changes the border color of the valid input to green.
background-color: #ccffcc; This line changes the background color of the valid input to light green.
</style> This tag ends the CSS style definition.
<form> This line starts the HTML form.
<label for="email">Your email:</label> This line creates a label for the email input field.
<input type="email" id="email" name="email" required> This line defines the input field where the user must enter an email.
</form> This tag closes the form definition.