File naming and URLs. Use descriptive file names. The HTML extension is .html . Not .htm . See 8.3, above.
File names are lower case.
If you use upper case letters, have a very good reason for it. Stick to alphanumerics and hyphen. Our server is a Unix machine, and life gets somewhat more difficult if you use files with spaces, ampersands, quotes, and so on in their names. HTM '' is bad. Don't use StudlyCaps to separate words.