In some cases it may be necessary to add a link to an extended description of an image, especially in cases where images are used to convey significant content. Presumably any students in a course would need an extended description in order to understand the structure of a saturated fat Links to Extended Descriptions NOTE: This kind of description would be useful if it was needed to understand the content, although a better strategy may be to include the description in the Web page itself, or to link to a longer description as discussed in the next section. The only double bond is on the right connecting the final carbon atom to an oxygen atom. Notice that the single bonds between elements make the carbon chain relatively straight. Example Text with Imageīelow is an image of a saturated fat molecule with 18 carbon molecules. See the Image page for examples of how this can be used in different situations.
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If a text description is already provided for an image within the main text of the page, then the ALT tag can just provide a summary of the image, not a full description. With no ALT tag, screen reader says “Image,” which leaves users wondering if they are missing anything important. This text is irrelevant to a screen reader user and increases reading time. Screen reader says “Rainbow line as a toolbar.” If you have eighteen rainbow toolbars, the screen reader would repeat this eighteen times. If images fail to load, ALT text will show what the images would have said in a browser such as Firefox. Note: Any text used in an image should follow legibility and contrast guidelines. WCAG 2.0 Guideline 1.1.1.-”All non-text content that is presented to the user has a text alternative that serves the equivalent purpose.” Image Button ExamplesĬonsider the images for sections a hypothetical education site below which all contain decorative text. In visual browsers such as Firefox, the ALT text is displayed when an image is broken, or when all images have been disabled. The ALT text adds a text description to an image on a Web page, and should be used for all images, graphical bullets, and graphical horizontal rules.ĪLT text is accessed by screen reader users to provide them with a text equivalent of images. ALT “Tag” – Shorthand reference to the ALT attribute.ALT attribute (HTML) – In HTML, the ALT text is inserted into the ALT attribute within the IMG tag.This can be implemented differently across document types. ALT text – the concept of adding a screen reader friendly text alternative description of an image.They may be used in different contexts, even within this Web site. There are several terms which are commonly used to describe ALT text.
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