A W3C recommendation is a specification that has been approved by the committee members and made public. This is the highest rating a specification can receive. If a specification is recommended by the W3C, chances are it will become the standard, if it isn't already.
A repeat visitor is someone who comes to your website more than once. Repeat visitors are important as it means that your site keeps its value for your customers.
A replaced element is any element whose appearance and dimensions are defined by an external resource
Amount of dots per inch held by a monitor screen. The higher the resolution is, the more definition the visualised images will have. Also known as DPI (Dots Per Inch).
RGB is an abbreviation for "Red Green Blue". RGB is a color model used on displays where red, green, and blue light are combined to make millions of colors. RGB is how colors combine on screens because they are viewed directly, and not reflected off
anything - like colors in traditional color theory which is based on reflective colors usually on paper.
CSS allows you to use RGB codes to define your website colors. To define a color in RGB with CSS, write rgb(255,0,0). The numbers go from 0 to 255, and they are listed in order red, green, blue.
RSS (Real Simple Syndication); often called Rich Site Summary, is a standard XML file format that ensures compatibility with many different machines/programs. RSS feeds also benefit users who want to receive timely updates from favourite websites or to aggregate data from many sites. Subscribing to a website RSS removes the need for the user to manually check the website for new content. Instead, their browser constantly monitors the site and informs the user of any
updates. There are other technologies similar to RSS, such as Atom.
RSS scraping is the use of full-feed RSS feeds to populate another website without providing attribution or links back to the content originator. Another form of RSS scraper may or may not provide attribution, but they also make changes to the content - removing links, changing words, or otherwise modifying the content that was syndicated.
A CSS rule is a declaration block for property assignment and a selector of the elements to which they have to be applied to.
