That said, here are some of the top 10 xhtml errors by philwebsupport:
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philwebsupport -15 Essential Checks before Launching Your Website:
15 Essential Checks before Launching Your Website: 1. Favicon - A favicon brands the tab or window in which your website is open in the user’s browser. It is also saved with the bookmark so that users can easily identify pages from your website.
2. Titles and Meta Data - Your page title is the most important element for SEO and is also important so that users know what’s on the page. Make sure it changes on every page and relates to that page’s content.
3. Cross-Browser Checks - check it in IE and see that everything is broken. It’s important that your website works across browsers. It doesn’t have to be pixel perfect, but everything should work, and the user shouldn’t see any problems. The most popular browsers to check are Internet Explorer 6, 7 and 8, Firefox 3, Safari 3, Chrome, Opera and the iPhone.
4. Read again - Read everything. Even if you’ve already read it, read it again. Get someone else to read it. There’s always something you’ll pick up on and have to change. See if you can reduce the amount of text by keeping it specific. Break up large text blocks into shorter paragraphs. Add clear headings throughout, and use lists so that users can scan easily. Don’t forget about dynamic text too, such as alert boxes.
5. Links - Don’t just assume all your links work. Click on them. You may often forget to add “http://” to links to external websites. Make sure your logo links to the home page, a common convention.
Also, think about how your links work. Is it obvious to new users that they are links? They should stand out from the other text on the page. Don’t underline text that isn’t a link because it will confuse users. And what happens to visited links?
6. Functionality Check - Test everything thoroughly. If you have a contact form, test it and copy yourself so that you can see what comes through. Get others to test your website, and not just family and friends but the website’s target market. Sit back and watch how a user uses the website. It’s amazing what you’ll pick up on when others use your website differently than how you assume they’d use it. Common things to check for are contact forms, search functions, shopping baskets and log-in areas.
8. Validation - You should aim for a 100% valid website. That said, it isn’t the end of the world if your website doesn’t validate, but it’s important to know the reasons why it doesn’t so that you can fix any nasty errors. Common gotchas include no “alt” tags, no closing tags and using “&” instead of “&” for ampersands.
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9. RSS Link - If your website has a blog or newsreel, you should have an RSS feed that users can subscribe to. Users should be able to easily find your RSS feed: the common convention is to put a small RSS icon in the browser’s address bar.
10. Analytics - Installing some sort of analytics tool is important for measuring statistics to see how your website performs and how successful your conversion rates are. Track daily unique hits, monthly page views and browser statistics, all useful data to start tracking from day 1. Google Analytics is a free favorite among website owners. Others to consider are Clicky, Kissmetrics (still in closed beta yet), Mint and StatCounter.
11. Sitemap - Adding a sitemap.xml file to your root directory allows the major search engines to easily index your website. The file points crawlers to all the pages on your website. XML-Sitemaps automatically creates a sitemap.xml file for you. After creating the file, upload it to your root directory so that its location is www.mydomain.com/sitemap.xml.
If you use WordPress, install the Google XML Sitemaps plug-in, which automatically updates the sitemap when you write new posts. Also, add your website and sitemap to Google Webmaster Tools. This tells Google that you have a sitemap, and the service provides useful statistics on how and when your website was last indexed.
12. Defensive Design - The most commonly overlooked defensive design element is the 404 page. If a user requests a page that doesn’t exist, your 404 page is displayed. This may happen for a variety of reasons, including another website linking to a page that doesn’t exist. Get your users back on track by providing a useful 404 page that directs them to the home page or suggests other pages they may be interested in.
Besides, depending on the publishing engine that you are using, you may need to consider taking more specific measures – for instance, if you are using WordPress, you may need to consider useful caching techniques to speed up the performance.
14. Back Up - If your website runs off a database, you need a back-up strategy. Or else, the day will come when you regret not having one. If you use WordPress, install Wordpress Database Backup, which you can set up to automatically email you backups.
15. Print Style Sheet - If a user wants to print a page from your website, chances are she or he wants only the main content and not the navigation or extra design elements. That’s why it is a good idea to create a print-specific style sheet. Also, certain CSS elements, such as floats, don’t come out well when printed.
To point to a special CSS style sheet that computers automatically use when users print a page, simply include the following code between your tags.