Writing error-free HTML is one of the best ways to help ensure that pages render optimally in as many browsers as possible. This includes older browsers, current browsers, future browsers, and browsers that run on tablets and mobile devices. You'll be able to prevent viewing problems before they happen. You won't have to wait until one of your visitors tells you about it. How many people are leaving your website because it's not displaying properly on their screen or not compatible with their web browser?
Simply testing web pages in browsers is not enough. Browsers can hide problems because they can be very forgiving, but what one browser forgives, another browser may not. Furthermore, while an error may be "forgiven" in one version of one browser, what about future versions of the browser, or older versions? Broken links can quickly drive visitors away. How many times have you been annoyed when you found a broken link? Don't waste time manually looking for problems, figuring out why your HTML doesn't display like it should, or using online checkers.
Remember: Time is money. Wouldn't you rather be doing something more productive than manually checking all those tags, attributes, properties, links, and more? Properly written HTML is more likely to be future-proof backward compatible with future standards and future web browsers. As of today, there is little or no certification for Web professionals, and only few universities teach Web technologies, leaving most Web-smiths to learn by themselves, with varied success. Seasoned, able professionals will take pride in creating Web content using semantic and well-formed markup, separation of style and content, etc.
Validation can then be used as a quick check to determine whether the code is the clean work of a seasoned HTML author, or quickly hacked-together tag soup. Validation, as any process of debugging code, is sometimes difficult, and the vast improvements in automatic error correction has made modern browser cope very well with errors in HTML or CSS. This makes validation seem useless or costly to many people, and the following questions or statement are widespread:.
The answer to this one is that markup languages are no more than data formats. So a website doesn't look like anything at all! It only takes on a visual appearance when it is presented by your browser. In practice, different browsers can and do display the same page very differently.
This is deliberate, and doesn't imply any kind of browser bug. It is indeed one of the principal strengths of the web, that for example a visually impaired user can select very large print or text-to-speech without a publisher having to go to the trouble and expense of preparing a separate edition.
Do remember: household-name companies expect people to visit because of the name and in spite of dreadful websites. Programming languages have functional purposes. HTML contains no programming logic. This is because HTML is not a programming language. In fact, HTML really shines when you use it in conjunction with an actual programming language, such as when using a web framework.
HTML is a core tenet of front end web development and is obviously a major aspect of what the user winds up seeing on their computer screen. This makes a solid understanding of HTML even more useful to have. So keep rocking the HTML, get to know it well, and by all means, code away!
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