1. remember to include lang = "langname" in <html> tag.
2. only use one h1 in one html.
3. remember to include alt attribute for <img> tags.
4. use img when it is one 'element'.
5. no <br> <center> <b> <i> <big> <frame>, etc. don't use. some of them are deprecated!
6. no inline tag inside a block tag. ex. <p> something <span> something </span> something </p>
7. no inline styling. ALL THE STYLES GO INTO CSS.
2. only use one h1 in one html.
3. remember to include alt attribute for <img> tags.
4. use img when it is one 'element'.
5. no <br> <center> <b> <i> <big> <frame>, etc. don't use. some of them are deprecated!
6. no inline tag inside a block tag. ex. <p> something <span> something </span> something </p>
7. no inline styling. ALL THE STYLES GO INTO CSS.