![]() Ideally, use a contrast ratio that is at least 4.5:1. For text that is at least 24px and normal weight or 19px and bold, use a contrast ratio that is at least 3:1. Text in images should match color contrast ratio minimums. A minimum size of 19px is a good rule of thumb, with larger being better. In general, text in images should be a generous size to mitigate pixelation when zoomed. If the image contains a considerable amount of text, the text should also be elsewhere on the page. If the image is of a small amount of text, the alt text must match the text in the image exactly. Images of text are best reserved when a particular visual presentation is essential, such as a logo. In general, websites should avoid images of text. Image alt Tag Tips for HTML (Penn State).An alt Decision Tree (Web Accessibility Tutorials).Alternative Text Guidance by Image Type (Benetech Diagram Center).Image Concepts (Web Accessibility Tutorials).To learn more about images, consider the following resources: ![]() Provide color contrast and other design elements to help color blind users Posters, flyers, and the like must have the same information presented in nearby text/.The image’s alt text should describe where the close by image is. Complex images, like charts or graphs, should have long description located near the image.Decorative images should have blank or empty alt text.Image links should describe the purpose of the link, and must never describe the image.Keyboard-only users or mobile users may never see the title. Avoid using the title attribute in lieu of alt text.Avoid “image of”, “photo of”, etc, unless the medium is particularly important.Consult the content editor slides at the top of the page for more examples. The same image can have quite different alt text depending on its context. When writing alt text, consider what details the author thought was most important. It should convey the purpose of the image, not describe the image. It should be brief: less than 250 characters. Understanding what makes good alt text is subtle and important. Confusingly, long descriptions never should be provided directly in the longdesc.) Image Guidelines (Developers and content editors should avoid using the longdesc HTML attribute altogether. Long descriptions are helpful when a brief alt text is not enough to convey information, such as in a complex chart or graph. Long descriptions are lengthier amounts of text provided nearby the image, such as in the next paragraph. Screen readers read alt text aloud, and browsers pages alt text when images fails to load. Content editors can generally provide alt text at the same time they upload images into websites. alt text is a brief label contained in the HTML code for the image. The most common form text alternative is alt text. These text alternatives provide the same information presented by the image. Whenever a page presents images and other non-text content, it should present text alternatives. Colorblind users benefit when all content, including images, uses generous color contrast ratios. When magnified, images can appear pixelated and hard to understand. Users with low vision often magnify the page. They can find moving, flashing, or automatically animating images (including gifs) problematic. Users with cognitive impairments, motion sensitivity, or seizure disorders may not tolerate some kinds of images well. In both cases, the browser will show the image’s alt text. Likewise, images may not load when a user has a slow internet connection. Users with cognitive impairments may prefer to disable images from loading. Text alternatives are also important when images do not load. When a screen reader encounters an image, it will attempt to read a text alternative. Pages should provide effective text alternatives for screen readers in the form of alt text. Screen reader users include people who are blind, have low vision, or have cognitive disabilities. How People with Disabilities Interact with ImagesĮditors, developers, and designers should consider screen reader users when using images. Hiding Decorative Images from Assistive Technology.Other Ways to Provide Text Alternatives.Charts, Graphs, and other Complex Images.How People with Disabilities Interact with Images.Download the Image Accessibility for Content Editors training slides.
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