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Research Credit Card Processing Reviews.If you’ve used any fancy CSS3 properties, these will invalidate your document as they’re not yet part of the spec, as long as you know they’re correct they can be ignored.
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An invalid CSS document isn’t going to have as much affect as an invalid HTML document, but you should run a validation check just to make sure you haven’t made any typos or mistakes in your code. Unlike HTML, CSS is used just to display the visual aspect of a web page, therefore the statement “If it looks good in the browser, why bother validating?” stands to a certain degree. They can include numbers, just not at the start of the word. Starting a class or ID with a numberĬlass, ID or name attributes can’t begin with a number. width and height attributes are perfectly fine in Transitional Doctypes, but if you’re aiming for perfection with a Strict Doctype you should know that presentational styling should be saved for the CSS stylesheet. This is probably a side effect of using a WYSIWYG editor which tend to insert HTML that shouldn’t really be there. Using attributes like “width” and “height” Otherwise a clear description of the image contents should be provided. If the image is for presentation purposes only the ALT attribute should still exist but may be left empty, eg: alt="". No ALT attribute added to imagesĮvery image inserted into your HTML document should have an ALT attribute to describe its contents. The is a block element, so it should wrap the anchor (an inline element) like so:īananas. A popular example is an anchor inside a header: Block elements inside inline elementsĪ fundamental rule of HTML is that block elements should never go inside inline elements. Links to sites built in PHP are likely to include variables in their links using the & character, so write these in your HTML using the & entity. Unencoded characters in URLsįollowing on from the last point, special characters, particularly the ampersand should also be converted to entities when they appear in URLs. Always remember to check through your body copy and convert any & signs to the HTML entity &, and all other special characters to their appropriate entity symbol. The ampersand is probably the most popular offender here, along with quotation marks that have been pasted in from Word. Forgetting this is just the same as forgetting a closing tag altogether. Most HTML elements have a separate closing tag, eg:, but other elements like input, img and meta are self-closing, this means they have a trailing slash before their closing bracket. The warning for this in the W3C validator is the cryptic message end tag for “p” omitted, but OMITTAG NO was specified – Which basically means Dude, you forget to close that paragraph tag Missing / on self-closing elements Forgetting to do so won’t just invalidate your HTML, it might also be the cause of some serious layout problems. If you’ve opened a tag somewhere in your HTML document, you must remember to close it in the appropriate place. To fix this error and all the subsequent issues, add an HTML or XHTML doctype to your page.
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The worst thing you could do validation wise is to forget a Doctype altogether! No Doctype means browsers will have to guess what language your page is written in. The thing is, all of these errors can be easily fixed in minutes.
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Many of the sites looked great, but as you can see, the quality of code just doesn’t match the quality of the design. Here’s a bunch of validation errors that were picked out from sites showcased on the first page of a well known CSS gallery.
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You wouldn’t want to supply a design full of typos or spelling errors, so you shouldn’t really settle for an HTML page full of little validation issues. I see invalid HTML little like spelling mistakes, although the client probably won’t see a mistake in your code, the idea is still the same. There’s also the aspect of professionalism. Not to mention the search engine bots for all you SEO people – You wouldn’t want to put obstacles in their way, a clean and valid page is going to be much easier for the bots to read and scan.
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These people might not be browsing the same as you, instead of seeing the visual website you’ve designed in a browser, they might be hearing the site through a screen reader.Īn error free HTML page is much more likely to be rendered correctly by a range of browsers, and maintain compatibility with future versions. An HTML page is made to present data, not visual graphics, so this data should be written correctly to ensure it’s readable by a wide spectrum of people who use the web. Remember that a website isn’t all about how it looks. If it looks OK in the browser, why bother validating? is a common response to validation.