1. B, D, A, C
2. The W3C guides the development of Web-related technologies.
3. C, D, A, E, B
4. Frontend design is concerned with aspects of a site that appear in or are related to the browser. Backend development involves the programming required on the server for site functionality.
5. A web authoring tool provides a visual interface for creating entire web pages, including the necessary (X)HTML, CSS, and scripts. HTML editors provide only shortcuts to writing (X)HTML documents manually.
1. You need to be aware that your page may look and work differently from browser to browser. Sticking to the standards will ensure a similar (although not identical) experience on modern standards-compliant browsers. For the rest, be sure that your content is available and accessible.
2. The platform on which your page is viewed can affect how certain page and form elements are rendered, the size of the text, availability of fonts and plug-ins, and the brightness of colors. Some technologies developed for Windows may not be as well supported on Mac or Unix platforms.