Websites are global. Great websites acknowledge that. You should make sure that your objective and purpose for building your website is clear so that all your readers will know exactly what you mean. Mrs. Wilkinson's website is a great example of writing for a global audience. Parents, peers, students and visitors to her site can easily relate to the references she makes regarding grade level curriculum and expectations. Her layout, choice of colors and pictures paint a vivid image of her classroom culture and feeling tone.
Writing for the web is different from writing for print. People skim online, especially when they first get to a page. You want the contents of your page to give them what they want quickly, but provide enough detail for those who want expansion on the basics. Mr. Phelps does an excellent job streamlining events and description of assignments due. Providing students archived posts of past assignments and the opportunity to turn in papers online via his website creates a fluent exchange of information for students, parents, and teacher.
No matter how great a website you build, you can never be all things to all people, nor contain all the relevant information & value a user might be seeking on your given topic. As such, it makes great sense to leverage the power of the web - the power of links - to create an easy, scalable path to making your site's experience better and more rewarding for those who visit. Check out the amazing use of multi media links on Mrs.Dietz's website for physical education!