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  2. First step to WCAG 2.0: errors
Rubrique Description
1 .HTML Use a W3C-conforming DTD syntax before the html element
2 .HTML Don't use wrong attribute syntax or non-conforming element hierarchy inside the html element
3 .HTML Use a title element as a child of the head element
4 .HTML When you provide a title element, do not leave it empty
5 .HTML Don't use a meta element with an http-equiv attribute and a value equal to refresh
6 .HTML Use the lang attribute for the html element
7 .HTML Use a valid language code for the lang attribute
8 .HTML Don't use a value other than ltr, rtl or empty for the dir attribute
9 .HTML Use the title attribute for every frame element
10 .HTML When you provide a title attribute for a frame element, do not leave it empty
11 .HTML Use the title attribute for every iframe element
12 .HTML When you provide a title attribute for an iframe element, do not leave it empty
13 .HTML Use at least one h1 element as a descendant of body element
14 .HTML When you provide a h1 element, do not leave it empty
15 .HTML When you provide a h2 element, do not leave it empty
16 .HTML When you provide a h3 element, do not leave it empty
17 .HTML When you provide a h4 element, do not leave it empty
18 .HTML When you provide a h5 element, do not leave it empty
19 .HTML When you provide a h6 element, do not leave it empty
20 .HTML Use  a h1, h2, h3, h4, h5 or h6 element as a first heading before a h2 element in the source order
21 .HTML Use a h2, h3, h4, h5 or h6 element as a first heading before a h3 element in the source order
22 .HTML Use a h3, h4, h5 or h6 element as a first heading before a h4 element in the source order
23 .HTML Use a h4, h5 or h6 element as a first heading before a h5 element in the source order
24 .HTML Use a h5 or h6 element as a first heading before a h6 element in the source order
25 .HTML Use a dt element as the first child of a dl element<br>
26 .HTML When you provide a li element, do not leave it empty
27 .HTML Don't use the align attribute
28 .HTML Don't use the xmp element
29 .HTML When you provide a p element, do not leave it empty
30 .HTML When you provide an a element, do not leave it empty except if it is used as an anchor
31 .HTML When you provide a button element, do not leave it empty
32 .HTML Don't use the vlink attribute
33 .HTML Don't use the text attribute
34 .HTML Don't use the link attribute
35 .HTML Use the alt attribute for every img element
36 .HTML Use the alt attribute for every area element
37 .HTML Use the alt attribute for every applet element
38 .HTML Use the alt attribute for every input type=image element
39 .HTML If the img element is the only child of a button or an a element, do not leave its alt attribute empty
40 .HTML When you provide an alt attribute for an input type=image element, do not leave it empty
41 .HTML When you provide an alt attribute for an area element, do not leave it empty
42 .HTML If an img element is a child of an a element with text, do not use the same text for its alt attribute as the text inside the a element
43 .HTML Don't use the border attribute
44 .HTML Don't use the same value for alt attributes for multiple area elements with different href values
45 .HTML Use a URI as the value for a longdesc attribute
46 .HTML Don't use the background attribute
47 .HTML Don't use the bgsound element
48 .HTML Use a caption element as the first child of a table element containing at least one th element
49 .HTML Don't use the same content for a caption element and a summary attribute
50 .HTML When you provide a caption element, do not leave it empty
51 .HTML Don't use a caption element in a table element containing only td elements
52 .HTML Don't use an alink attribute
53 .HTML Don't use the same content for a summary attribute and a caption element
54 .HTML When you provide a summary attribute for a table element containing a th or a caption element, do not leave it empty
55 .HTML Don't use a summary attribute on a table element containg only td elements
56 .HTML Don't use the strike element
57 .HTML Don't use the listing element
58 .HTML Use at least one th element inside a table element with a caption element or a non-empty summary attribute
59 .HTML Use a scope or id attribute for every non-empty th element
60 .HTML Don't use a value other than row or col for the scope attribute
61 .HTML Don't use the bgcolor attribute
62 .HTML Don't use the tt element
63 .HTML Use a headers attribute on every td element if the corresponding th element has an id attribute
64 .HTML Don't use the plaintext element
65 .HTML Don't use for a headers attribute a value which matches an id attribute used for a td of the table element
66 .HTML Use a button, or an input of type submit, image or button inside a form element
67 .HTML When you provide an input type=submit, do not leave its value attribute empty
68 .HTML Don't use the marquee element
69 .HTML Use a legend element as a child of every fieldset element
70 .HTML Don't use a fieldset element without a form element
71 .HTML When you provide a legend element, do not leave it empty
72 .HTML Use the for attribute for every label element
73 .HTML When you provide a for attribute for a label element, do not leave it empty
74 .HTML A for attribute must have a value that matches an id attribute inside the form element
75 .HTML Use the label attribute for every optgroup element
76 .HTML Don't use the same label attribute for different optgroup elements of the same select element
77 .HTML When you provide a label attribute for an optgroup element, do not leave it empty
78 .HTML Don't use the basefont element
79 .HTML Don't use the blink element
80 .HTML Don't use the center element
81 .HTML Don't use the font element

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