Accessibility Checking for Large Sites
Rocket Validator integrates axe-core version 4.8 into an automated web site scanner.
Axe Core 4.8 rules checked by Rocket Validator.
To avoid assistive technology missing the second instance, the value supplied to an id property must be distinct. In other words, id attributes may not be used more than once to distinguish one element from another within the same document.
Elements on a page are uniquely identified via the ID attribute. It makes no sense to make a second id.
Duplicate ids can make labels for forms, table header cells, etc. inaccessible since screen readers and client-side scripts pass over the second iteration. They are typical markup validation mistakes that, if they do not damage accessibility, can reduce potential causes of accessibility issues.
Those who are familiar with client-side scripting are aware that when an ID is reused, the script normally only reacts to the first instance of that id use. Similar to this, assistive technology might only appropriately reference the first id when referencing an id.
What this Accessibility Rule Checks
Makes certain that every element on the page with an id attribute has a distinct value for the id attribute.
It is a best practice to make sure each heading element, denoted by the tags <h1> through <h6>, contains text.
Users of screen readers are informed when a heading tag is present. Users may become confused or even unable to access information on the page’s structure if the headline is blank or the text cannot be accessible.
Users of this technology won’t be able to hear the content of a header if the text inside it is inaccessible to a screen reader. Users using screen readers must be able to access the contents since headings reveal the structure of a webpage.
Applying header markup (<h1> through <h6>) is a quick approach to make content stand out, but doing so will make it more difficult for those using assistive technology to navigate a website.
Due to the fact that search engines use headings when filtering, arranging, and showing results, headers offer advantages beyond just making a page more accessible. Making your website more searchable is another benefit of making it more accessible.
Users of screen readers can navigate between headings in the same manner that sighted users might skim a page to gain a sense of its contents. Users, especially those who use screen readers, can save a ton of time and stress by using well-written, logically-arranged headings.
What this Accessibility Rule Checks
Ensures that headings have content and that a screen reader can access that content.
The text in table header components should be visible. Make sure screen reader users can access the table header. It is preferable to mark up an element with a td if it is not a header.
Both sighted users and screen reader users should be able to comprehend the visible text that explains the purpose of the row or column in table header components.
What this Accessibility Rule Checks
Verifies that each table header element has a visible text.
Whether native HTML or a custom widget, user input elements need to play the right roles in order to make their meaning clear to screen reader users when they are focused on and landed on. If a custom widget, the element’s function must be correctly exposed by using appropriate ARIA role values rather than abstract roles.
In order for screen reader technology to convey information to users, elements in the focus order must play a function appropriate for interactive content.
If interactive content elements do not have the proper roles, the developer’s planned accessibility function cannot be carried out by the role.
When screen readers and other assistive technologies cannot communicate to the user the proper role of each element on the web page, they are unable to interact with it sensibly. Assistive technology cannot communicate with an HTML element’s set of features, properties, and ways of communicating information to and/or from the user when the value for a role is invalid.
What this Accessibility Rule Checks
Verifies that the role attribute value is accurate and suitable for all interactive components in the focus order, regardless of whether they are native HTML or customized ARIA widgets.
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Makes certain that a form field doesn’t have multiple labels.
For some combinations of screen readers and browsers, adding several labels to the same form field can result in issues, and the outcomes vary depending on the combination. The first label will be read by some combinations. The last label will be read by some. Both labels will be read by others.
What this Accessibility Rule Checks
Makes certain that a form field doesn’t have multiple labels.
tabindex="-1" cannot be present in <frame> and <iframe> elements with focusable content.
The browser is unable to move the focus to the content included in a frame when it has a negative tabindex. This stops keyboard navigation from skipping all of its content, and if the frame is scrollable, it also prevents the focus from moving to any element from which the frame may be scrolled.
What this Accessibility Rule Checks
Examine all frame and iframe elements that contain a negative tabindex value, such as tabindex="-1". If there are any such frames, make sure they don’t have nested frames that do contain focusable items.
12,500 Accessibility and HTML checks per week. Fully automated.
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Tests with axe-core are required for frames.
The tool cannot do violation testing on numerous levels of nested iframes without the axe-core script.
What this Accessibility Rule Checks
Axe is instructed to run within iframes when the iframes property is set to true. This checks for the axe-core script to deliver a “review item” result using both frame and iframe selectors.
To help screen reader users understand the contents of each frame or iframe element in the document, each element must have a distinct title.
A frame title is used by screen reader users to describe the contents of the frame. If the frames are not identified with a title element, navigating across frames and iframes can soon become challenging and confusing for users of this technology.
Users of screen readers can choose to display a list of all the titles for the frames on a page. Users can locate the frame they’re looking for more quickly by adding descriptive, distinctive labels. Without titles, moving between frames can become challenging and perplexing very quickly. Screen readers will instead provide information such as “frame,” “javascript,” the filename, or the URL if there is no title specified. This information won’t usually be particularly useful.
What this Accessibility Rule Checks
Make sure that the title attribute on every iframe and frame element is distinct and not empty.
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.
The h1 through h6 element tags must be in a sequentially-descending order for headings to be in a correct logical order.
The fundamental goal of headers is to communicate the page’s organizational structure. The same goal is served by employing various font sizes for sighted users.
For screen reader users, however, text size is useless because a screen reader can only recognize a header if it is correctly marked up. When header components are used correctly, both sighted and screen reader users will find it much simpler to traverse the page.
Users of screen readers can navigate between headings in the same manner that sighted users might skim a page to gain a sense of its contents. Users, especially those who use screen readers, can save a ton of time and stress by using well-written, logically-arranged headings.
Headings serve to explain the organization of the webpage, not only to draw attention to key text. They ought to be succinct, distinct, and accompanied by h1 through h6 components used in hierarchical order. Headings are useful tools for screen reader users because of all of these characteristics. Screen reader users can move among headings in a manner akin to how sighted readers can quickly scan a page and get a sense of its content. Screen readers can save time and stress by using headings that are clearly written and arranged.
Since search engines employ headings when filtering, arranging, and showing results, headings offer other advantages outside just making the page more easily accessible. Making your website more searchable is another benefit of making it more accessible.
What this Accessibility Rule Checks
Ensures the semantic accuracy of the headings’ order.
50,000 Accessibility and HTML checks per month. Fully automated.
Let our automated scanner check your large sites using Axe Core and W3C Validator.