I do research in reverse engineering Google's "Content Score" portion of their rank equation.
Best HTML Tags for SEO - The Current Rankings...
"Best HTML Tags" are refreshed every 15 minutes.
rank - Indicates where it fell in the SERPs.
test - Indicates what was being tested.
code - Indicates the ordinal of the test page's link on the index of tests that was submitted to Google
rank test code
1 title 001
2 title 001
3 dl > dt > dd 055
4 blockquote 014
5 p 011
6 thead > td 050
7 tfoot > td 051
8 samp 027
9 dfn 025
10 u 007
11 h5 061
12 h6 062
13 caption 021
14 q 043
15 tfoot > td 051
16 acronym 016
17 sub 047
18 var 029
19 strike 046
20 p 011
21 legend 030
22 h4 060
23 b 006
24 h1 003
25 samp 027
26 strike 046
27 i 008
28 ins 034
29 ins 034
30 big 019
31 h6 062
32 span 012
33 center 022
34 h5 061
35 label.for 035
36 body 002
37 h3 005
38 del 024
39 em 026
40 big 019
41 h4 060
42 small 045
43 td 049
44 q 043
45 dl > dt 054
46 abbr 015
47 acronym 016
48 code 023
49 font 031
50 legend 030
51 caption 058
52 h1 003
53 textarea 033
54 i 008
55 kbd 028
56 strong 009
57 address 017
58 pre 042
59 h2 004
60 ul.li 036
61 tt 018
62 div 013
63 span 012
64 h2 004
65 ul.li 036
66 pre 042
67 caption 058
68 strong 009
69 s 044
70 em 026
71 caption 021
72 index index
73 img.alt 053
74 select > option 040
75 a 056
76 img.alt 053
77 meta-author.value 039
78 meta-description.value 037
79 object > param.name 041
80 document document
81 meta-value.value 038
82 input-input.value 032
83 a.href 057
84 a.href 057
85 unknown other
tag A > tag B - Nesting of Tag B within Tag A
tag . attribute - Using an attribute inside the opening tag
index - A page linking to all the tests
document - An empty page with the secret keywords in the document name
path - An empty page with the secret keywords in the the url path
unknown - Not a test, but probably a registrar log entry about the creation of the domain name
NOTE: Some tests don't appear in the Google results. All Tags and Attributes are continually tested. We obtained our list of tags from w3schools
NOTE: Some tests appear more than once in the results at times. This happens when Google ranks both
www.domain.com/test014.html and
www.domain.com/test014.html. In the near future I may resolve this by using canonical tags to credit the best url for the content. Currently I don't understand why google crawls both. I only submitted the www. version.
see:
http://www.blackhatworld.com/blackhat-seo/black-hat-seo/116692-wh-info-bh-mind.html for details on my method.