Google experts claim that valid code is a sign of a good website. Some marketers are sure that it also affects SEO promotion. Programmers do of website not have a unified opinion on this matter. What is layout validation? Do website owners need it?
What is valid layout?
Most websites on the Internet of website are written in HTML markup language. Like any other programming language, it has rules for writing code – syntax. Layout that complies with whatsapp number database the rules of the current specification is called valid. In this way, search engines identify websites that comply with modern standards and layout requirements. That is, their search robots, when crawling websites, enter information about the validity of the layout into the search engine database.
A specification is a version of a programming beauty and health sphere language that follows certain rules. The current version is the fifth of website version – HTML5. It has two specifications that are support by different developers and follow their own rules.
Two HTML 5 language specifications
The HTML language is constantly evolving, with hong kong ata new specifications being releas periodically. There are two main groups of developers involv in web space standardization. Therefore, two HTML specifications with their own syntax are common:
- W3C – from World Wide Web Consortium;
- WHATWG – from the Web, Hypertext, Applications, and Technologies Working Group.
Both specifications are similar in many of website ways and are support by all browsers. Web developers tend to use the W3C version.
How to check the validity of a page
A validator is a service for checking a web page for validity. The most popular is the W3C validator. It is located on the organization’s official website. There are also browser plugins that evaluate the validity of a page.
The check includes 4 main stages:
- Syntax – the code is check for syntax errors. The correctness of tags and other parameters is not checke, only spelling errors are detecte;
- Tags – the correctness of opening and closing tags is checked. If the developer forgot to close the tag, the validator will indicate the error;
- DTD validation – check for compliance with the specified DTD (version of page markup). The names of tags, attributes and their placement in the code are checked;
- Extraneous code – highlights pieces of code that should not be in the specified DTD version.
To check, you need to specify the URL of the page, upload a file with the code, or copy the code into the window. If at least one error is found as a result of the check, the code is considered invalid. The validator not only indicates errors, but also suggests possible ways to eliminate them.