A default style sheet that’s part of a browser. If the designer declares no style rules, then the defaults from the browser will be applied. Most browsers tend to apply style sheets to all the web documents. While these style sheets vary from one browser to another, they have certain common traits such as purple visited links, black text, and blue links etc. These are all referred to as “default” browser style sheet.
This is the software used in viewing web pages. Google Chrome, Internet Explorer and Mozilla Firefox are some of the common browsers, however, there are also others such as Opera and Safari. Since each browser is different, the pages can also vary in appearance based on the browser used. This aspect needs to be kept in view while designing & testing sites.
These are links to webpages that no longer exist or which have been moved to some different URL without any redirection. These types of links generally serve pages with the “404 error” message. Most search engines provide different ways for visitors to report on these dead or broken links.