Top On Page Optimization Factors for SEO

1.Page Title Element
2.Page Name (url)
3.Keyword prominence
4.Keyword proximity
5.Keyword density
6.Location of Keywords on the Page (beginning to end, keywords in links, location of keywords in paragraph, footer, sidebar, header etc)
7.Number of occurrences of keyword
8.Heading Tags (h1-h3)
9.Text Type (bold, italic)
10.Links(Anchor text, location of links(header/footer..), title tag, inbound links, outbound links)
11.Images(file name, title element, alt attribute, location of image in the page, links on image)
12.Number of words in a page
13.Page layout (css errors, html errors, xhtml compliant)
14.Meta Tags (description, keywords, robots, content type)
15.Lower and Upper case letters in words