Validating your web pages | Computing (2024)

FAQs

What is validating web pages? ›

In simple terms, validation ensures that your website complies with the standards accepted by most web designers. That also means that it will be accessible to more people, across more web browsers and operation systems. Having an accessible website is also regarded as good web design practice.

Validating someone shows you understand their feelings and point of view, even when you disagree. It establishes trust, helping the other person feel supported and open to discussing solutions.

Data validation is the process of verifying and validating data that is collected before it is used. Any type of data handling task, whether it is gathering data, analyzing it, or structuring it for presentation, must include data validation to ensure accurate results.

In order to validate your code, you have to declare the standard to which it adheres. To describe the HTML standard (the document type declaration, DTD), the file should contain a DOCTYPE declaration (before the HTML code). Here are a few examples (from http://www.htmlhelp.com/tools/validator/doctype.html).

Look for the secure padlock: Chrome, Safari, Internet Explorer and Firefox browsers display a padlock in the URL field to indicate "safe" websites. You can click on the padlock to confirm that the certificate belongs to the same company as the website you are trying to visit.

Validation is an automatic computer check to ensure that the data entered is sensible and reasonable. It does not check the accuracy of data. For example, a secondary school student is likely to be aged between 11 and 16. The computer can be programmed only to accept numbers between 11 and 16. This is a range check.

We commonly classify process validation based on the timing of its execution relative to the production schedule. According to this description, there are four distinct types of process validation: prospective validation, retrospective validation, concurrent validation, and revalidation.

Examples of validating statements. I can see that you are very (upset, sad, frightened, scared). I guess that must have been hard for you. I can see you are making an effort.

Alternatively, you can use browser extensions or add-ons like HTML Validator for Firefox or W3C Validator for Chrome to validate your HTML code directly from your browser and highlight any mistakes in your source code or web page.

The simplest HTML validation feature is the required attribute. To make an input mandatory, add this attribute to the element. When this attribute is set, the element matches the :required UI pseudo-class and the form won't submit, displaying an error message on submission when the input is empty.

What does validating an HTML file do? ›

An invalid web page might look fine in your browser, but someone accessing the page in another browser might have an entirely different experience with the same content. Valid HTML assures that all standards-compliant browsers will display the page reliably.

A URL is a string used to identify a resource. A URL is a valid URL if at least one of the following conditions holds: The URL is a valid URI reference [RFC3986]. The URL is a valid IRI reference and it has no query component.

This is called form validation. When you enter data, the browser and/or the web server will check to see that the data is in the correct format and within the constraints set by the application.

Input validation errors occur when websites fail to properly validate user input, leaving them vulnerable to various attacks such as SQL injection, cross-site scripting (XSS), and command injection, making them a significant threat to web security.

Valid HTML assures that all standards-compliant browsers will display the page reliably.