This assists those using a keyboard (and potentially also a screen reader) to navigate through the links on a web page. A 'skip to main content' link allows user bypass repeated sections such as a sites main navigation links.
This links to Ensure that the user can navigate with a keyboard below.
The following image is a demonstrative example of the 'Skip to content' link used on the New Generation Technologies for Learning site's Technical Standards page.
In the following example the red arrow indicates the point in the page that the tabbing jumps to when the 'Skip to content' link is selected.
The technique for this requires linking to an element within the web page. W3C schools site provides tutorials on HTML Links (Opens in new window)) and a 'Try it Yourself' (Opens in new window) example to link to an element within a page.
This relates to web forms and submission of correctly formatted information.
"The error message should be as specific as possible. In the case of an unsuccessful form submission, re-displaying the form and indicating the fields in error is insufficient for some users to perceive that an error has occurred. Screen reader users, for example, will not know there was an error until they encounter one of the indicators. They may abandon the form altogether before encountering the error indicator, thinking that the page simply is not functional." W3C - Understanding WCAG 2.0 - Understanding SC 3.3.1 - Error Identification (Opens in new window)
"The identification and description of an error can be combined with programmatic information that user agents or assistive technologies can use to identify an error and provide error information to the user. For example, certain technologies can specify that the user's input must not fall outside a specific range, or that a form field is required.
It is perfectly acceptable to indicate the error in other ways such as image, color etc, in addition to the text description."
W3C - Understanding WCAG 2.0 - Understanding SC 3.3.1 - Error Identification (Opens in new window)
This requirement refers to time based media and users are given enough time to complete tasks on a site. The following is a good example of content controlled by the user:
This assists those using screen readers and/or keyboards.
The image below demonstrates a screen print of the WebAIM web site with the tab order highlighted. The tab order refers to the order in which a person can use a keyboard to tab through the links on a page.
The live site can be found at http://webaim.org/ (Opens in new window).
"Visual effects that flicker or produce a strobe-like effect may cause seizures in some individuals. Seizures induced by flickering or strobe-like effects are known as photoepileptic seizures. Seizures can be dangerous. Don't be responsible for causing them."
WebAIM: Creating Accesible Images - Graphics that Cause Seizures (Opens in new window)
See WebAIM: Creating Accessible Images - Graphics that Cause Seizures (Opens in new window) for example.
This will assist any user that cannot access a resource.
Providing an equivalent text resource allows content to be changed into forms that user may need. These can include:
WCAG 2.0 - Guideline 1.1 (Opens in new window)
Create an alternative accessible resource and provide a link it.
An example of this is Providing a transcript for all audio.
This will ensure that the web page or web content can be accessed by as many people as possible.
Table 2 - Recommended test platforms for e-learning content of Desktop platforms specifies the recommendations for use in the Australian VET system in 2011.