If you don’t hang around webmaster circles, you haw not realise that HTML determination and CSS determination are controversial issues with whatever people. This article discusses whatever of the positions taken in these discussions to provide whatever perspectives on issues that hit become increasingly to the fore in scheme development. Hopefully, the article module also provide a applicatory method that overworked webmasters crapper ingest to improve their website.
Some Background Information: What does Validating HTML or CSS Mean?

For those who are unknown with what validating a scheme tender (ie validating your HTML or CSS code) means, it essentially refers to using a program or an online service to analyse that the scheme tender that you created is liberated of errors.

In particular, an HTML validator checks to attain trusty the HTML cipher on your scheme tender complies with the standards set by the W3 Consortium (the organisation that issues the HTML standards). There are assorted types of validators - whatever analyse exclusive for errors, others also attain suggestions most your code, telling you when a certain way of writing things might lead to (say) unexpected results.

The W3 Consortium has its own online validator which you crapper ingest for free. It haw be institute at: http://validator.w3.org/

A CSS validator checks your Cascading Style Sheets in the same manner; basically, most module analyse them to attain trusty that they obey with the CSS standards set by the W3 Consortium. There are a few which module also tell you which CSS features are based by which browsers (since not every browsers are equal in their CSS implementation).

Again, you crapper intend liberated determination for your call sheets from the W3 Consortium: http://jigsaw.w3.org/css-validator/

There are numerous another validators around, both liberated and commercial, focusing on assorted aspects of ensuring that your cipher module separate trouble-free across browsers and platforms. You crapper encounter a list of liberated ones (including technical validators like those that analyse your cipher for accessibility) from Free HTML Validators, CSS Validators, Accessibility Validators at http://www.thefreecountry.com/webmaster/htmlvalidators.shtml

Note that validating your scheme tender does not ensure that it module appear as you poverty in assorted browsers. It merely ensures that your cipher is without HTML or CSS structure errors. Ensuring that your cipher appears aright in assorted browsers require cross application testing. You crapper feature more information most how to do this even if you exclusive hit digit machine from the article How to Check Your Website with Multiple Browsers on a Single Computer at http://www.thesitewizard.com/webdesign/multiplebrowsers.shtml
Why Validate Your HTML Code?

The proponents of HTML determination (and CSS validation, of course) feature that there are a number of reasons ground you should reassert your code:

1.
It Helps Cross-Browser, Cross-Platform and Future Compatibility

Although you haw be able to create a scheme tender that appears to impact on your selection application (whatever that haw be), your tender haw contain HTML errors (or CSS errors) that do not show up with that application due to an existing quirk or bug. Another person using a assorted application that does not share that portion fault module wind up watch a tender that does not show up correctly. It is also possible that after versions of your application module fix that bug, and your tender module be busted when grouping ingest the latest personification of the browser.

Coding your pages so that it is correct without errors module termination in pages that are more likely to impact across browsers and platforms (ie, assorted systems). It is also a form of insurance against future versions of browsers, since every browsers aim towards deference with the existing HTML and CSS standards.
2.
Search Engine Visibility

When there are errors in a scheme page, browsers typically essay to equilibrate in assorted ways. Hence whatever browsers haw cut the busted elements patch others attain assumptions most what the scheme specializer was trying to achieve. The problem is that when see engines obtain your tender and essay to parse them for keywords, they module also hit to attain certain decisions most what to do with the errors. Like browsers, assorted see engines module belike attain assorted decisions most those errors in the page, resulting in certain parts of your scheme tender (or perhaps even the entire tender if your error is early in the page) not being indexed.

The safest way, it is held, is to attain trusty that your scheme tender validates error-free. That way, there is no disagreement most which part of your tender should be scanned for keywords and the like.
3.
Professionalism

Even if you test your scheme place with every the assorted browsers in cosmos on every the platforms in ingest (Mac, Linux, Windows, FreeBSD, etc) and encounter that it works perfectly in all, errors in your place emit poorly on your power as a scheme developer.

The issue is two-fold: firstly, a poorly coded scheme tender reveals that either the scheme specializer does not undergo his stuff or is a sloppy worker; secondly, it affects his marketability.

Why Not Validate?

Those who are against a blanket rule most determination often cite the following reasons:

1.
Validation is No Guarantee that Page Works

Even if you reassert your code, you ease hit to test it in the assorted browsers. Having cipher with no structure errors does not mean that the HTML or CSS cipher does what you want. Hence whatever of the proponents of this view argue that the main content when artful a scheme tender is to attain trusty it is viewable and usable by your visitors, not whatever esoteric content of standards compliance.
2.
Time Constraint for Conversion

In an saint world, you poverty every your pages to be usable and error free. In the actual concern however, many scheme designers with thousands of existing pages module be hard-pressed to encounter instance to convert every those pages so that they reassert correctly. Since these pages are already doing substantially on the web, both with existing browsers and see engines, instance is better spent doing impact that is actually productive.
3.
The Average Visitor Does Not Check Your Source Code

Against the discussion most professionalism is the counter-argument that the average traveller to your place is not likely to go around your place watch the maker cipher to your pages in an effort to locate HTML or CSS errors. To the visitor, how the tender appears in his/her application is the true test of the scheme designer’s skill.

One Possible Solution

Like whatever scheme designers, I started artful scheme sites long before I realized that there were tools that could reassert my pages for correctness. By the instance I started validating and correcting my pages, I already had hundreds of existing pages that I needed to correct, including pages on thesitewizard.com and thefreecountry.com.

My concerns were primarily cross-browser and cross-platform sympathy as substantially as see engine indexability. I didn’t poverty an error on my pages that I might woman seeing with my application but that creeps up in another browsers, systems or the see engines. However, the problem was that converting hundreds of pages is not exactly my idea of a pleasant day’s work.

I decided to take the approach I saw on a website. If I remember correctly, I conceive it was the W3 Consortium’s own website that mentioned this method. At that time, they had a notice stating that they knew that not every their pages complied with the standards. However, every new pages they created module reassert correctly, as module whatever old pages that they updated.

I realise that this is not the "ideal" that whatever webmasters argue for; but it is a applicatory solution for a scheme specializer with many existing pages. If you are in the same boat, with too many existing pages to contemplate revamping everything, you might poverty to study taking this route. It haw not salve your feel (ie, the craftsman’s feel at producing a perfect work), but at least it module support you cope with the workload.
How Often Should I Validate?

Some grouping reassert every instance they attain a modification to their pages on the grounds that cursory mistakes crapper become whatever time. Others reassert exclusive when they attain a major organisation change.

I always reassert the template for my pages when I attain a major organisation change. I essay to reassert my pages each instance I attain modifications, although I must admit that I sometimes block to do so (with the occasional disastrous consequence; Murphy’s Law doesn’t spare webmasters).

I encounter that having an offline validator helps to attain trusty that I remember to validate: having to go online just to reassert my pages tends to attain me put off determination till later, with the termination that it’ll occasionally intend overlooked. For those not familiar with the word I use, when I feature "offline validator" I simply mean a validator that I crapper download and install in my own machine so that I crapper separate it on my pages without having to go to the W3 Consortium’s website. You crapper encounter offline validators on the liberated validators tender I mentioned earlier, that is, http://www.thefreecountry.com/webmaster/htmlvalidators.shtml

The HTML Tidy validator (listed on that page) is available for numerous platforms (including Linux, Mac, Windows, etc) and has proven helpful to many webmasters the concern over.
Conclusion

Validating your HTML and CSS cipher for standards deference has certain benefits: it protects your pages from problems arising from structure errors in your cipher due to assorted ways of interpreting errors by the see engines and another browsers. If, however, you hit a large number of existing pages that hit not been validated and corrected, but nonetheless impact substantially in see engines and another browsers, you might need to study whatever variety of strategy (such as the digit I used) to preclude webmaster-overload.

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