Usage statistics - View per sub-test

Period

Start date: 1 April 2008

End date: 10 January 2010

Duration: 650 days

Number of sub-tests failed

Repartition per number of sub-tests failed
Per number of sub-tests failed
Number of sub-tests failed URIs (%) Domains (%)
mobileOK pages 9% 4%
1 sub-test failed 4% 4%
2 sub-tests failed 4% 5%
3 sub-tests failed 5% 6%
4 sub-tests failed 5% 7%
5 sub-tests failed 7% 9%
6 sub-tests failed 7% 10%
7 sub-tests failed 7% 10%
8 sub-tests failed 6% 9%
9 sub-tests failed 6% 9%
10 sub-tests failed 6% 8%
11 sub-tests failed 6% 7%
12 sub-tests failed 6% 7%
13 sub-tests failed 5% 6%
14 sub-tests failed 4% 5%
15 sub-tests failed 3% 4%
16 sub-tests failed 2% 3%
17 sub-tests failed 2% 3%
18 sub-tests failed 1% 2%
19 sub-tests failed 1% 2%
20 sub-tests failed 1% 1%
21 sub-tests failed 1% 1%
22 sub-tests failed <1% 1%
23 sub-tests failed <1% <1%
24 sub-tests failed <1% <1%
25 sub-tests failed <1% <1%
26 sub-tests failed <1% <1%
27 sub-tests failed <1% <1%
28 sub-tests failed <1% <1%
29 sub-tests failed <1% <1%
30 sub-tests failed <1% <1%

Sub-test(s) failed

Per sub-test failed
Best Practice Fail message URIs (%) Domains (%)
VALID_MARKUP The document does not validate against XHTML Basic 1.1 or MP 1.2. 78% 87%
MEASURES A length property uses an absolute unit 60% 69%
PAGE_SIZE_LIMIT The total size of the page exceeds 20 kilobytes 55% 66%
IMAGES_SPECIFY_SIZE Either the height or width attribute is missing 48% 59%
CACHING The document is served without caching information ("Expires" or "Cache-Control" header) 39% 50%
CHARACTER_ENCODING_USE The HTTP Content-Type header does not specify a character encoding and no UTF-8 encoding or a non-UTF-8 is specified in the XML declaration 37% 48%
PAGE_SIZE_LIMIT The size of the document's markup exceeds 10 kilobytes 34% 44%
POP_UPS A pop-up was detected 32% 35%
TABLES_LAYOUT Table contains less than two tr elements 31% 33%
VALID_MARKUP The document does not contain a DOCTYPE declaration 30% 28%
TABLES_LAYOUT Table contains less than two td elements 28% 29%
NON-TEXT_ALTERNATIVES The alt attribute is missing 27% 32%
STYLE_SHEETS_USE The document contains one of basefont, bdo, center, del, dir, font, ins, menu, s, strike or u elements 26% 26%
TABLES_NESTED There are nested tables 26% 25%
CONTENT_FORMAT_SUPPORT The embedded image or object is not of type image/gif or image/jpeg 25% 35%
CHARACTER_ENCODING_USE The HTTP Content-Type header does not specify a character encoding but it specifies an Internet media type starting with "text/" and there is no meta element with http-equiv attribute that specifies UTF-8 character encoding 24% 32%
CHARACTER_ENCODING_USE The character encoding is specified in more than one way, and not all values are the same 21% 27%
CONTENT_FORMAT_SUPPORT The CSS style sheet is not syntactically valid CSS 18% 24%
CHARACTER_ENCODING_SUPPORT The document is not valid UTF-8 16% 22%
EXTERNAL_RESOURCES There are more than 20 embedded external resources 16% 23%
PAGE_TITLE There is no page title 15% 11%
HTTP_RESPONSE HTTP status code 4xx other than 404 (Not Found) or 401 (Unauthorized) received 13% 17%
IMAGES_RESIZING the height or width specified is less than the correseponding dimension of the image 12% 15%
HTTP_RESPONSE HTTP status code 404 (Not Found) or 5xx (Server Error) received for an embedded resource 9% 12%
CHARACTER_ENCODING_SUPPORT The HTTP Content-Type header specifies a character encoding other than UTF-8 9% 11%
HTTP_RESPONSE Invalid HTTP response received (network-level error, DNS resolution error, or non-HTTP response) 8% 10%
OBJECTS_OR_SCRIPT A "javascript:" link is used 8% 11%
MINIMIZE More than 25% of the page characters are extraneous (whitespaces or comments) 7% 10%
IMAGE_MAPS An input element with type attribute set to "image" is present 7% 10%
TABLES_LAYOUT A table cell contains only an image whose actual dimensions are 2x2 or less 6% 8%
CONTENT_FORMAT_SUPPORT The document is not an HTML document 6% 8%
VALID_MARKUP The root html element does not declare its namespace 6% 7%
NO_FRAMES The document contains a frame, frameset or iframe element 6% 8%
IMAGE_MAPS A usemap attribute is present 4% 5%
VALID_MARKUP The image does not match its supposed format 3% 5%
IMAGES_RESIZING The height or width is not specified in pixels 3% 4%
HTTP_RESPONSE HTTP status code 3xx (Redirection) received to a URI whose scheme is neither HTTP nor HTTPS 3% 1%
GRAPHICS_FOR_SPACING There is a bigger than 2 pixels transparent image 2% 3%
REDIRECTION The document uses a markup-based redirection 2% 3%
CONTENT_FORMAT_SUPPORT The document is not served as "application/xhtml+xml", "application/vnd.wap.xhtml+xml", or "text/html" 2% 2%
NON-TEXT_ALTERNATIVES The alt attribute consists only of white space 1% 2%
CONTENT_FORMAT_SUPPORT The CSS style sheet is not served as "text/css" 1% 1%
NO_FRAMES <1% <1%
HTTPS The certificate does not match the requested URI. <1% <1%
NO_FRAMES <1% <1%
HTTP_RESPONSE HTTP status code 3xx (Redirection) received but no HTTP Location header <1% <1%
DEFAULT_INPUT_MODE The inputmode attribute of this input element is invalid. <1% <1%
OBJECTS_OR_SCRIPT The document uses an applet <1% <1%
REDIRECTION The document uses a Refresh HTTP header to redirect to a different page <1% <1%
IMAGE_MAPS An ismap attribute is present <1% <1%
HTTP_RESPONSE HTTP status code 401 (Unauthorized) received <1% <1%
OBJECTS_OR_SCRIPT The content of the object element consists only of white space <1% <1%
HTTPS The certificate is invalid. <1% <1%
OBJECTS_OR_SCRIPT The object fallback mechanism does not define a textual representation of the object <1% <1%
NO_FRAMES <1% <1%
HTTP_RESPONSE The response to the resource PLACEHOLDER_1 is an HTTPS response and the certificate is invalid <1% <1%

Warnings

Warnings
Best Practice Warning message URIs (%) Domains (%)
CONTENT_FORMAT_SUPPORT The document is not served as "application/xhtml+xml" 89% 94%
LINK_TARGET_FORMAT The linked resource character encoding may not be appropriate for mobile devices 70% 73%
STYLE_SHEETS_USE The CSS Style contains invalid at-rules, properties, or values 54% 63%
META_HTTP_EQUIV An HTTP response header that matches the meta http-equiv element exists but their values differ 52% 57%
STYLE_SHEETS_USE The style attribute is used 51% 57%
CHARACTER_ENCODING_USE The resource does not specify UTF-8 as character encoding 49% 59%
STYLE_SHEETS_SUPPORT The CSS Style sheet contains rules referencing the position, display or float properties 49% 61%
OBJECTS_OR_SCRIPT The document uses scripting 46% 62%
TABLES_ALTERNATIVES A Table element exists 41% 45%
CONTENT_FORMAT_SUPPORT The document uses an XHTML doctype that is not a well-known mobile-friendly doctype 34% 46%
META_HTTP_EQUIV A matching HTTP response header does not exist for the meta http-equiv element 27% 29%
OBJECTS_OR_SCRIPT An element uses an event attribute 26% 37%
STYLE_SHEETS_USE The documents uses one of b, big, i, small, sub, sup or tt elements 26% 32%
HTTP_RESPONSE HTTP status code 3xx (Redirection) received and the HTTP Location header targets a relative URI 26% 25%
DEFAULT_INPUT_MODE The inputmode attribute of this textarea element is invalid. 25% 33%
CACHING "Cache-Control" HTTP header is present and contains value "no-cache", or contains value "max-age=0" 22% 26%
MINIMIZE More than 10% of the page characters are extraneous (whitespaces or comments) 21% 28%
CACHING The "Expires" header contains a date in the past 17% 21%
CACHING The "Pragma" header contains the value "no-cache" 16% 21%
EXTERNAL_RESOURCES There are more than 10 embedded external resources 16% 21%
LINK_TARGET_FORMAT The linked resource format may not be appropriate for mobile devices 16% 20%
GRAPHICS_FOR_SPACING There is a small fully transparent image 15% 19%
LINK_TARGET_FORMAT The fragment reference has no matching target 14% 18%
CACHING A cache related header or a meta http-equiv value contains an invalid value 14% 17%
HTTP_RESPONSE HTTP status code 404 (Not Found) or 5xx (Server Error) received for a linked resource 13% 15%
IMAGES_RESIZING the height or width specified is greater than the corresponding dimension of the image 12% 15%
CACHING The document's caching information is not provided in the HTTP headers 11% 8%
VALID_MARKUP The document does not validate against its declared doctype. 9% 10%
CONTENT_FORMAT_SUPPORT The document uses a non-XML doctype 6% 8%
PROVIDE_DEFAULTS There is no default selected option element 5% 7%
CACHING There is an error in the "ETag" header 4% 3%
GRAPHICS_FOR_SPACING There are more than one fully transparent images 4% 5%
CACHING There is an error in the "Last-Modified" header 3% 2%
HTTP_RESPONSE HTTP status code 404 (Not Found) or 5xx (Server Error) received for the resource under test 3% 3%
STYLE_SHEETS_USE All styles are restricted to CSS media types other than "handheld" or "all" 2% 2%
DEFAULT_INPUT_MODE There is no inputmode attribute on this textarea element. 2% 2%
PROVIDE_DEFAULTS There is more than one input element in this group set to "checked" 1% 2%
OBJECTS_OR_SCRIPT The Internet media type indicated by the Content-Type HTTP Header of the retrieved resource is not "image/jpeg" or "image/gif" 1% 2%
HTTP_RESPONSE HTTP status code 401 (Unauthorized) received for a linked resource 1% 1%
HTTPS The certificate has expired. <1% <1%
OBJECTS_OR_SCRIPT The object element is empty <1% <1%
PROVIDE_DEFAULTS There is more than one option selected by default <1% <1%
OBJECTS_OR_SCRIPT The Internet media type of the retrieved resource, as indicated by its Content-Type HTTP header does not match that stated in the type attribute <1% <1%
HTTP_RESPONSE The response to the resource PLACEHOLDER_1 is an HTTPS response and the certificate has expired <1% <1%
OBJECTS_OR_SCRIPT There is no type attribute <1% <1%
AUTO_REFRESH The document uses an auto-refresh <1% <1%
AUTO_REFRESH The document is served with a Refresh HTTP header <1% <1%

A few notes

mobileOK, tests, and sub-tests

Tests performed by the mobileOK checker are defined in the mobileOK Basic Tests 1.0 document. The term sub-test used below refers to an aspect of a given test that may FAIL.

How to read the percentages

The statistics only take into account the URIs for which the checker could run the tests. The checker typically cannot run the tests when:

A given URI may yield different results in time. When a URI is checked more than once during the period, only the most recent result appears in the statistics. This ensures that statistics are not biased by pages that include a mobileOK logo along with a link to the checker for instance.

URIs or domains?

Viewing statistics per URI isn't the most representative view one could think of. A better view would be "per website". Unfortunately, there's no automatic way to link pages of a website together. The statistics include a view per domain name, but domain names are often used by many different websites, and thus this view is probably even more misleading than the view per URI. The better view is somewhere between the view per URI and the view per domain name, closer to the view per URI...

Does it represent the state of the Web?

No! One must keep in mind that the URIs that were checked come from users that chose to use the mobileOK checker. This does introduces a bias in the sample oriented towards mobile-friendliness. Figures in terms of the number of Mobile Web Best Practices not followed would likely be far worse if the stats were computed from a representative set of URIs. However, these stats do provide a useful view of the most common problems content authors encounter when moving to mobile.

On missing Mobile Web Best Practices

Also keep in mind that the tests only cover a restricted set of the Mobile Web Best Practices. Besides, they sometimes cover only a portion of one given Best Practice. In particular, a few Mobile Web Best Practices that cannot be automatically checked, such as CENTRAL_MEANING, SCROLLING are not covered by the tests, and as such cannot appear in these statistics.

Alternatively, some generic tests are performed that do not match any of the Mobile Web Best Practices and are identified by their internal name within the mobileOK Basic Tests 1.0 document, e.g. HTTP_RESPONSE, META_HTTP_EQUIV.