Usage statistics - View per sub-test

Period

Start date: 1 December 2008

End date: 31 December 2008

Duration: 31 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 5% 4%
1 sub-test failed 4% 3%
2 sub-tests failed 4% 4%
3 sub-tests failed 5% 5%
4 sub-tests failed 6% 7%
5 sub-tests failed 7% 8%
6 sub-tests failed 8% 9%
7 sub-tests failed 8% 9%
8 sub-tests failed 7% 8%
9 sub-tests failed 8% 9%
10 sub-tests failed 6% 7%
11 sub-tests failed 6% 7%
12 sub-tests failed 5% 6%
13 sub-tests failed 5% 5%
14 sub-tests failed 4% 5%
15 sub-tests failed 3% 3%
16 sub-tests failed 3% 3%
17 sub-tests failed 2% 2%
18 sub-tests failed 2% 2%
19 sub-tests failed 1% 1%
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%

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. 83% 88%
MEASURES A length property uses an absolute unit 63% 68%
PAGE_SIZE_LIMIT The total size of the page exceeds 20 kilobytes 60% 67%
IMAGES_SPECIFY_SIZE Either the height or width attribute is missing 55% 61%
CACHING The document is served without caching information ("Expires" or "Cache-Control" header) 41% 46%
PAGE_SIZE_LIMIT The size of the document's markup exceeds 10 kilobytes 40% 46%
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 40% 44%
POP_UPS A pop-up was detected 32% 35%
TABLES_LAYOUT Table contains less than two tr elements 31% 33%
CONTENT_FORMAT_SUPPORT The embedded image or object is not of type image/gif or image/jpeg 31% 35%
VALID_MARKUP The document does not contain a DOCTYPE declaration 28% 28%
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 27% 31%
NON-TEXT_ALTERNATIVES The alt attribute is missing 27% 30%
TABLES_LAYOUT Table contains less than two td elements 27% 28%
TABLES_NESTED There are nested tables 24% 26%
STYLE_SHEETS_USE The document contains one of basefont, bdo, center, del, dir, font, ins, menu, s, strike or u elements 24% 26%
CHARACTER_ENCODING_USE The character encoding is specified in more than one way, and not all values are the same 23% 26%
CHARACTER_ENCODING_SUPPORT The document is not valid UTF-8 20% 23%
EXTERNAL_RESOURCES There are more than 20 embedded external resources 19% 23%
CONTENT_FORMAT_SUPPORT The CSS style sheet is not syntactically valid CSS 18% 21%
HTTP_RESPONSE HTTP status code 4xx other than 404 (Not Found) or 401 (Unauthorized) received 15% 17%
PAGE_TITLE There is no page title 12% 11%
IMAGES_RESIZING the height or width specified is less than the correseponding dimension of the image 11% 13%
HTTP_RESPONSE Invalid HTTP response received (network-level error, DNS resolution error, or non-HTTP response) 10% 12%
HTTP_RESPONSE HTTP status code 404 (Not Found) or 5xx (Server Error) received for an embedded resource 10% 11%
CHARACTER_ENCODING_SUPPORT The HTTP Content-Type header specifies a character encoding other than UTF-8 9% 10%
IMAGE_MAPS An input element with type attribute set to "image" is present 9% 10%
OBJECTS_OR_SCRIPT A "javascript:" link is used 8% 10%
MINIMIZE More than 25% of the page characters are extraneous (whitespaces or comments) 8% 9%
NO_FRAMES The document contains a frame, frameset or iframe element 7% 8%
TABLES_LAYOUT A table cell contains only an image whose actual dimensions are 2x2 or less 7% 8%
IMAGE_MAPS A usemap attribute is present 5% 5%
VALID_MARKUP The image does not match its supposed format 4% 5%
VALID_MARKUP The root html element does not declare its namespace 4% 5%
IMAGES_RESIZING The height or width is not specified in pixels 3% 4%
REDIRECTION The document uses a markup-based redirection 3% 3%
GRAPHICS_FOR_SPACING There is a bigger than 2 pixels transparent image 2% 2%
CONTENT_FORMAT_SUPPORT The document is not served as "application/xhtml+xml", "application/vnd.wap.xhtml+xml", or "text/html" 2% 2%
CONTENT_FORMAT_SUPPORT The document is not an HTML document 2% 2%
NON-TEXT_ALTERNATIVES The alt attribute consists only of white space 1% 2%
HTTPS The certificate does not match the requested URI. 1% 1%
HTTP_RESPONSE HTTP status code 3xx (Redirection) received to a URI whose scheme is neither HTTP nor HTTPS 1% 1%
CONTENT_FORMAT_SUPPORT The CSS style sheet is not served as "text/css" 1% 1%
DEFAULT_INPUT_MODE The inputmode attribute of this input element is invalid. <1% <1%
IMAGE_MAPS An ismap attribute is present <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%
HTTP_RESPONSE HTTP status code 3xx (Redirection) received but no HTTP Location header <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%

Warnings

Warnings
Best Practice Warning message URIs (%) Domains (%)
CONTENT_FORMAT_SUPPORT The document is not served as "application/xhtml+xml" 91% 93%
META_HTTP_EQUIV An HTTP response header that matches the meta http-equiv element exists but their values differ 73% 76%
LINK_TARGET_FORMAT The linked resource character encoding may not be appropriate for mobile devices 72% 75%
STYLE_SHEETS_USE The CSS Style contains invalid at-rules, properties, or values 61% 66%
STYLE_SHEETS_USE The style attribute is used 55% 60%
STYLE_SHEETS_SUPPORT The CSS Style sheet contains rules referencing the position, display or float properties 55% 60%
OBJECTS_OR_SCRIPT The document uses scripting 55% 62%
CHARACTER_ENCODING_USE The resource does not specify UTF-8 as character encoding 51% 56%
CONTENT_FORMAT_SUPPORT The document uses an XHTML doctype that is not a well-known mobile-friendly doctype 44% 50%
TABLES_ALTERNATIVES A Table element exists 42% 45%
DEFAULT_INPUT_MODE The inputmode attribute of this textarea element is invalid. 33% 36%
OBJECTS_OR_SCRIPT An element uses an event attribute 32% 37%
STYLE_SHEETS_USE The documents uses one of b, big, i, small, sub, sup or tt elements 30% 34%
META_HTTP_EQUIV A matching HTTP response header does not exist for the meta http-equiv element 27% 28%
CACHING "Cache-Control" HTTP header is present and contains value "no-cache", or contains value "max-age=0" 26% 27%
HTTP_RESPONSE HTTP status code 3xx (Redirection) received and the HTTP Location header targets a relative URI 25% 27%
MINIMIZE More than 10% of the page characters are extraneous (whitespaces or comments) 23% 26%
CACHING The "Expires" header contains a date in the past 21% 24%
CACHING The "Pragma" header contains the value "no-cache" 20% 22%
LINK_TARGET_FORMAT The linked resource format may not be appropriate for mobile devices 20% 22%
EXTERNAL_RESOURCES There are more than 10 embedded external resources 18% 21%
GRAPHICS_FOR_SPACING There is a small fully transparent image 18% 20%
CACHING A cache related header or a meta http-equiv value contains an invalid value 17% 18%
LINK_TARGET_FORMAT The fragment reference has no matching target 15% 17%
HTTP_RESPONSE HTTP status code 404 (Not Found) or 5xx (Server Error) received for a linked resource 12% 13%
IMAGES_RESIZING the height or width specified is greater than the corresponding dimension of the image 12% 14%
VALID_MARKUP The document does not validate against its declared doctype. 9% 9%
CACHING The document's caching information is not provided in the HTTP headers 7% 6%
CONTENT_FORMAT_SUPPORT The document uses a non-XML doctype 7% 8%
PROVIDE_DEFAULTS There is no default selected option element 6% 7%
GRAPHICS_FOR_SPACING There are more than one fully transparent images 5% 6%
STYLE_SHEETS_USE All styles are restricted to CSS media types other than "handheld" or "all" 2% 3%
HTTP_RESPONSE HTTP status code 404 (Not Found) or 5xx (Server Error) received for the resource under test 2% 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" 2% 2%
PROVIDE_DEFAULTS There is more than one input element in this group set to "checked" 2% 2%
HTTP_RESPONSE HTTP status code 401 (Unauthorized) received for a linked resource 2% 1%
DEFAULT_INPUT_MODE There is no inputmode attribute on this textarea element. 2% 2%
CACHING There is an error in the "Last-Modified" header 1% 1%
CACHING There is an error in the "ETag" header <1% <1%
OBJECTS_OR_SCRIPT The object element is empty <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%
AUTO_REFRESH The document uses an auto-refresh <1% <1%
HTTP_RESPONSE The response to the resource PLACEHOLDER_1 is an HTTPS response and the certificate has expired <1% <1%
HTTPS The certificate has expired. <1% <1%
PROVIDE_DEFAULTS There is more than one option selected by default <1% <1%
OBJECTS_OR_SCRIPT There is no type attribute <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.