Slow loading is a curse for websites. It drives away the visitors more quickly than any other factor. People have a lot of choices and they do not have much time to spend on your site. So, you have to be more concerned about the issue. You can prevent the problem by getting good hosting services and avoiding too large images on the site.
Including animation requires a higher degree of care. HTML5 and CSS3 are quite useful to include the animation. They provide lightweight animation. If you feel uncomfortable with adding animation, do not add it. It's better to not use animation than to use it inappropriately.
Site Loaded With Banner Ads
The websites loaded with banner ads is most likely to detract the visitors. It by no means implicates that you should not place the banner ads on your site. The focus is that you should be and you have to be professional in placing banners. The users must not get the notification of a widget seller site for the reason of over loading of banner ads.
Function and Design
Function is to be given more importance than design. Do not over customize the design of your site so as to interrupt the functions.Function and design do not always have to fight; they supplement each other almost all of the time. A good looking design creates an efficient website much better, while excellent performance will create up for a deficiency in visual appeal ever.
Bolding Too Much Text
To bold a text is a good idea for putting emphasis on any important area of the content. But if you bold too much text, it will give a bad look to your web pages. It may detract the interest of your visitors to stay on your site for the reason bolding too much text makes the content hard to read. The best way of bolding the text is to bold only the words you want your visitors to stay on or to be noticed.
Inconsistent designing is one of the most annoying mistakes committed by numerous webmasters. It is as common as grievous. You should design all headers, sub headers, and page content with the same design features. The titles on all the pages must have the same color and same font style. Man, by nature, loves symmetry and beauty. Mixed-and-matched design attributes create confusion.
Use of Graphics
Loading your site with large graphics is a grievous mistake. These graphics take too long to load and it drives the visitors back. Even it happens that some webmasters use meaningless or useless graphics or the graphics with no alt text. Both these practices are harmful to your site.
Never Ending Pop-Ups
You know the type. You must have an experience with such sites which leave no way to escape from pop-ups except by closing the internet down. It brings no benefit. Did you ever buy a product due to these pop-ups? Off course, never. Such practices have bad effects.