#1. If you’re designing a website, make sure the code you write has a valid HTML+CSS. Although most browsers can make sense of code that isn’t valid, it could be rendered correctly or incorrectly. Valid code will render the same way most of the time in modern browsers. You can check the validity of your HTML code with an HTML validator.
#2. When you are creating graphics or photos for your website, be sure to keep the file size small. If your graphics are too large, your page will load slowly and your visitors will leave. You can find many free or inexpensive graphics programs online that will optimize your images before you load them to your website.
#3. Don’t use OnExit popups on your website. This tactic is mainly used by internet marketers who are trying a last-ditch attempt to get a sale. Word about these kinds of popups get around, and they will kill your reputation as a marketer. Mozilla has even taken steps to suppress the text on these popups, citing security risks.
#4. Make sure your site passes the NoScript test. Download and activate the NoScript extension for Firefox and see if your site is still readable. Some content, such as ordering systems for products, can’t work without scripts, but if your site is simply blank with scripts turned off, that’s bad news.
#5. Make sure all of your webpages actually have titles, and make sure they are descriptive. A surprising number of webpages out there are called “untitled document” or “new document”. This not only denies visitors a useful piece of information to remember your site, but also absolutely destroys your SEO, since search engines weight page titles heavily when ranking sites.
#6. Web design is a subject that you always want to stay informed on. With this in mind, if you have any friends that are also into web design then you will want to keep in contact with them. You can exchange any new information you learn so that you’re both on top of your game when it comes to web design.
#7. Avoid using frames. Most sites have abandoned frames on their own as better alternatives have become available, but there are still sites out there that are trapped in 1996. Alternatives to navigational frames include fixed-position navigation panels, having navigation in multiple areas (e.g. left and bottom) or simplifying page structure so that navigational links are never far away.
#8. Avoid cramming page elements together. Each section of your page should be naturally separated from each other, as this makes the purpose of each section more clear. The easiest way to separate sections is by using DIVs, but there are other ways, including absolute positioning (not recommended), the CSS margin command, and floats.
#9. Before you publish any web page, check it carefully for broken links. Nothing is more frustrating to a visitor than clicking on a link and being taken to an error page. You can check your links manually, or there are programs that will scan your site for you and report any broken links.