Alexa Top 100 Accessibility

Written on December 05, 2011

The following data comes from automated accessibility testing of the Alexa Top 100 US websites (minus the pr0n, search engines, social networks and sites primarily driven from user content) using AQUA and lists their performance from worst to best (based on density of errors per page). This information comes with the important caveat that it is limited to automated testing. That being said, my own experience has been that poor performance in automated accessibility testing is strongly correlated with poor performance in manual accessibility testing as well.

Site
Name

Errors

Warnings

Pages Tested

Avg Per Page (Errors +
Warnings)

Avg. Per Page (Errors Only)

LA Times

75

46

1

121.00

75.00

Wal Mart

23691

9404

500

66.19

47.38

IMDB

22746

35552

496

117.54

45.86

CNN

22255

18354

498

81.54

44.69

Answers

21663

2477

500

48.28

43.33

Roadrunner

183772

131066

4979

63.23

36.91

Huffington Post

17652

2697

499

40.78

35.37

Best Buy

383

1886

12

189.08

31.92

Fox News

11456

5478

361

46.91

31.73

Weather Channel

13868

13035

491

54.79

28.24

Washington Post

12850

19892

464

70.56

27.69

NFL

12104

27059

498

78.64

24.31

CNET

11863

34408

499

92.73

23.77

eHow

3987

1464

199

27.39

20.04

Wall St. Journal

201

243

16

27.75

12.56

New York Times

6085

6458

496

25.29

12.27

Microsoft

4824

15804

431

47.86

11.19

Apple

4690

6705

500

22.79

9.38

Chase

2908

848

361

10.40

8.06

BBC

3823

10364

483

29.37

7.92

PayPal

2992

4822

498

15.69

6.01

AOL

60

56

10

11.60

6.00

About.com

833

401

142

8.69

5.87

Netflix

2544

1814

474

9.19

5.37

Verizon Wireless

1447

940

275

8.68

5.26

Comcast

1803

745

368

6.92

4.90

USPS

1158

3289

338

13.16

3.43

Wells Fargo

1176

3831

479

10.45

2.46

UPS

2

272

1

274.00

2.00

Bank of America

489

6316

314

21.67

1.56

Some Definitions

Error

In this context, an “error” is something that was found using a test which us clearly ‘pass/fail’ in nature. Things such as missing alt attributes for images fall into this category.

Warning

In this context, a “warning” is something that was found using a test which does not have a clear ‘pass/fail’ criteria but would instead require human inspection to verify.