Accessibility Checking for Large Sites
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Image buttons must have alternate text
Ensures
<input type="image">elements have alternate text.An
<input type="image">button must have alternate text, otherwise screen reader users will not know the button's purpose. Even if the image contains only text, it still requires alternate text, since a screen reader cannot translate images of words into output.Text Alone Is Not A Label: Just typing text next to the form element is not sufficient to create a true label. Assistive technologies like screen readers require labels in code that can be determined programmatically. Some screen readers are programmed to guess what the label should be, based on the surrounding text, but this method is not fool-proof and can lead to confusion if the screen reader guesses wrong.
Learn more about this accessibility rule at Deque University >>
Other WCAG: 1.1.1 accessibility rules checked by Rocket Validator
Aria meter elements must have discernible text that clearly describes the destination, purpose, function, or action for screen reader users.
Screen reader users are not able to discern the purpose of elements with role="meter" that do not have an accessible name.
Aria progressbar elements must have discernible text that clearly describes the destination, purpose, function, or action for screen reader users.
Screen reader users are not able to discern the purpose of elements with role="progressbar" that do not have an accessible name.
All images must have alternate text to convey their purpose and meaning to screen reader users.
Screen readers have no way of translating an image into words that gets read to the user, even if the image only consists of text. As a result, it's necessary for images to have short, descriptive alt text so screen reader users clearly understand the image's contents and purpose.
If you can't see, all types of visual information, such as images, are completely useless unless a digital text alternative is provided so that screen readers can convert that text into either sound or braille. The same is true in varying degrees for people with low vision or color-blindness.
When you do not provide an acceptable alternative that works for their available sensory modalities, such as making an image accessible by providing a digital text description, screen readers cannot convert it into speech or braille to make it available by sound or touch.
All embedded objects must have text alternatives to be read out to screen reader users.
Screen readers have no way of translating non-text content into text announced to users. Instead, they read out alternative text. For screen reader users to obtain the information contained in embedded object elements which must contain short, descriptive alternative text.
The object element defines an embedded object within a document. It is used to embed multimedia (audio, video, applets, etcetera.) or another web page into the document. The object element needs a text alternative so that users of screen readers know the contents of the object.
When writing a text alternative, keep in mind that the purpose of the alternative text is to relay information to blind users about the image’s contents and purpose - blind users should be able to get as much information from alternative text as a sighted user gets from the image. Alternative text should give the intent, purpose, and meaning of the image.
When writing alternative text, it’s helpful to keep the following questions in mind:
- Why is the non-text content here?
- What information is it presenting?
- What purpose does it fulfill?
- If I could not use the non-text content, what words would I use to convey the same information or function?
Be sure that all text contained in this attribute is useful. Words like “chart”, “image”, “diagram”, or image file names tend not to be very useful.
Ensures elements marked role="img" elements have alternate text.
Screen readers have no way of translating an image into words that gets read to the user, even if the image only consists of text. As a result, it's necessary for images to have short, descriptive and accessible alternative text so screen reader users clearly understand the image's contents and purpose.
If you can't see, all types of visual information, including images, are completely useless unless an accessible text alternative is provided which screen readers can convert into either sound or braille. People with low vision or color-blindness disabilities also require accessible alternative text to varying degrees.
Screen readers cannot convert visual image information to speech or braille in the absence of an accessible text alternative associated with the image.
Ensures SVG elements with an <img>, graphics-document or graphics-symbol role have an accessible text alternative.
The intent of Success Criterion 1.1.1 is to make information conveyed by non-text content (including SVG images) accessible through the use of a text alternative. Text alternatives are a primary way for making information accessible because they can be rendered through any sensory modality (for example, visual, auditory or tactile) to match the needs of the user. Providing text alternatives allows the information to be rendered in a variety of ways by a variety of user agents. For example, a person who cannot see a picture can have the text alternative read aloud using synthesized speech. A person who cannot hear an audio file can have the text alternative displayed so that he or she can read it. In the future, text alternatives will also allow information to be more easily translated into sign language or into a simpler form of the same language.