Accessibility Checking for Large Sites
Rocket Validator integrates axe-core version 4.6, into an automated web site scanner.
Image buttons must have alternate text
Makes certain that <input type="image"> elements have alternate text.
Screen reader users will not understand the function of a <input type="image"> button unless equivalent wording is provided. Even if the image merely contains text, alternate text is required because a screen reader cannot interpret images of words into output.
Simply typing text adjacent to the form element will not result in a true label. Screen readers, for example, require labels in code that can be determined automatically.
Some screen readers are configured to estimate the label based on the surrounding text, however this method is not foolproof and might cause confusion if the screen reader guesses incorrectly.
What this Accessibility Rule Checks
Ensures that each <input type="image"> has a name that can be found.
Learn more:
Related Accessibility Rules Checked by Rocket Validator
An image map consists of a single image with numerous clickable sections. Because screen readers cannot translate graphics into text, an image map, like all images, must contain alternate text for each of the distinct clickable parts, as well as for the larger image itself.
In the absence of alternate text, screen readers often announce the image’s filename. Filenames do not accurately describe images and are therefore inconvenient for screen reader users.
What this Accessibility Rule Checks
Ensures that image map area elements have alternate text.
Not all ARIA role-attribute combinations are valid. This rule ensures that each role has the required qualities.
Using ARIA attributes in roles where they are not permitted can impair web page accessibility. Using an improper role-attribute combination will have no effect on application accessibility at best and may trigger behavior that blocks accessibility for entire areas of an application at worst.
When ARIA attributes are used on HTML elements that do not conform to WAI-ARIA 1.1, they interfere with the semantics of the elements, causing assistive technology products to display nonsensical user interface (UI) information that does not represent the document’s true UI.
What this Accessibility Rule Checks
Checks that each element with an ARIA role is using only the ARIA attributes that are permitted for that role.
ARIA widget roles must contain attributes describing the widget’s state or properties.
ARIA widget roles necessitate additional properties describing the widget’s state. If a needed attribute is missing, the widget’s status is not conveyed to users of screen readers.
Some roles function as composite user interface widgets. As such, they serve as containers that manage the widgets they contain. When an object inherits from several ancestors and one ancestor indicates support for a property and another says the property is required, the property becomes required on the inheriting object. In some circumstances, default values are sufficient to meet ARIA attribute requirements.
When required state and property attributes for specific roles (and subclass roles) are missing, screen readers may be unable to communicate the element’s role definition to the user.
What this Accessibility Rule Checks
Checks all elements with the role attribute to ensure that all necessary attributes are defined.
Some ARIA parent role values must contain specific child elements and role values in order to execute the intended accessibility function.
WAI-ARIA outlines specifically, for each role, which child and parent roles are permitted and/or required. ARIA roles lacking needed child roles will not be able to execute the desired accessibility functions.
The user’s context must be communicated by assistive technology. In a treeitem, for instance, it is essential to know the parent (container), item, and siblings in the folder. This is possible in two ways:
- Code order or DOM: The context required is frequently evident from the code order or DOM.
-
ARIA: ARIA (such as
aria-owns) can be used to provide relationships when the hierarchy differs from the code structure or the DOM tree.
What this Accessibility Rule Checks
Checks each element containing a WAI-ARIA role for the presence of all requisite child roles.
When was the last time you validated your whole site?
Keep your sites healthy checking for A11Y/HTML issues on an automated schedule.
Certain ARIA roles must be enclosed by specific parent roles in order to carry out their intended accessibility functions.
WAI-ARIA outlines specifically, for each role, which child and parent roles are permitted and/or required. Elements with ARIA role values that lack needed parent element role values will prevent assistive technology from functioning as the developer intended.
When it is necessary to convey context to a user of assistive technology in the form of hierarchy (for example, the importance of a parent container, item, or sibling in a folder tree), and the hierarchy is not the same as the code structure or DOM tree, it is impossible to provide relationship information without using ARIA role parent elements.
What this Accessibility Rule Checks
Checks each WAI-ARIA role-containing element to confirm that all required parent roles are present.
Valid values must be present for ARIA properties that begin with aria-.
To fulfill the intended accessibility purpose, these values must be written correctly and relate to values that make sense for a certain property.
ARIA attributes (those beginning with aria-) must have legitimate values. For a given attribute to fulfill the intended accessibility function, these values must be written correctly and correlate to values that make sense.
A diverse range of values are accepted for many ARIA attributes. There must be permitted values, acceptable “undefined” values, and acceptable “default” values.
Content that does not adhere to the permitted values is inaccessible to users of assistive technology.
What this Accessibility Rule Checks
Verifies that the WAI-ARIA attributes’ values are correct for each element that contains them.
12,500 Accessibility and HTML checks per week. Fully automated.
Let our automated scanner check your large sites using Axe Core and W3C Validator.
The names of ARIA attributes beginning with “aria-“ must be correct.
A reference to an invalid attribute or an attribute that doesn’t exist will result in a violation of this rule.
The accessibility function intended by the developer will not be fulfilled if the developer uses an invalid or misspelled ARIA attribute.
User interface components meant to increase the accessibility and interoperability of web and application content must adhere to properly worded and up-to-date ARIA properties in order for assistive technology to provide suitable information to people with disabilities.
Insufficient usage of the WAI-ARIA 1.1 W3C Recommendation’s attributes prevents developers from correctly communicating user interface actions and structural information to assistive technology in document-level markup.
What this Accessibility Rule Checks
Verifies that all elements that contain WAI-ARIA attributes have those attributes and that they are legitimate attributes.
For screen reader users, buttons must include recognizable text that specifies the destination, purpose, function, or action.
Users of screen readers are unable to determine the function of elements with the roles role="link", role="button", and role="menuitem" that lack an accessible name.
What this Accessibility Rule Checks
Verifies that each button has a distinguishable, accessible label.
When used in a document, the frame or iframe element’s title attribute must not be empty in order to provide context for users of screen reader software.
Users of screen readers depend on the title of a frame to describe its contents. If the HTML for a frame or iframe element lacks a title attribute, navigating within the element can be a frustrating and time-consuming experience for users of this technology.
Users of screen readers can see a list of the frames on a page and their respective titles. Providing each frame with a distinct, descriptive label facilitates easy navigation. Without titles, it’s easy to get lost trying to jump from one frame to the next. Screen readers will instead provide information like “frame,” “JavaScript,” the filename, or the URL if no title is provided. This data is unlikely to be useful in most situations.
What this Accessibility Rule Checks
Make sure the title attribute of every iframe and frame element is both distinct and not empty.
To express their purpose and meaning to screen reader users, all images must include alternate text.
Even if the image just contains text, screen readers have no way of translating it into words that are read to the user. As a result, photos must have concise, descriptive alt text so that screen reader users grasp the image’s contents and purpose.
If you can’t see, all visual information, such as photographs, is meaningless unless a digital text equivalent is provided so that screen readers may translate that text into either sound or braille. People with limited eyesight or colorblindness experience the same phenomenon to varied degrees.
Screen readers cannot translate an image into speech or braille to make it available by sound or touch if you do not provide a suitable alternative that works for their available sensory modalities, such as making an image accessible by providing a digital text description.
What this Accessibility Rule Checks
Ensures that all <image> elements have alternative text and either role="presentation" or role="none" (ARIA 1.1).
When was the last time you validated your whole site?
Keep your sites healthy checking for A11Y/HTML issues on an automated schedule.