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For example, the information provided by the image might already be given using adjacent text, or the image might be included to make the website more visually attractive. In these cases, a null (empty) alt text should be provided ( alt="" ) so that they can be ignored by assistive technologies, such as screen readers.

Here are a few important keys to writing effective image alt text: Describe the image, and be specific. ... Add context that relates to the topic of the page. ... Keep your alt text fewer than 125 characters. ... Don't start alt text with "picture of..." or "Image of..." ... Use your keywords, but sparingly.

When you have connectivity issues or your image's path is incorrectly declared, your image may not be loaded to your webpage. In this case, the alt text value is shown in the place of the image. The alt text provides the descriptive meaning of an image that search engines can use to improve your web page's SEO.

Because the image does not convey additional content, alt="" is the most appropriate choice. When an image is used only for decorative purposes, it is best to remove the image from the page content and instead define it as a CSS background image.

Image descriptions provide much more detailed description than alt text, allowing the user to learn more about what is in the image, beyond alt text. Alt text gives the user a short condensed description, while long image descriptions provide explicit detail.

Images as Links: If the image is being used to link to another page, the alt text should describe what will happen when the image is clicked (rather than what it looks like). For example, the alt text for an image of a question mark that links to a help page should be ?Contact Support? rather than ?question mark.?

Adding alternative text to images on your site is a principle of web accessibility. Alt attributes enable screen readers to read the information about on-page images for the benefit of a person with complete lack of sight, visually impaired, or who is otherwise unable to view the images on the page.

A Few More Tips to Make Images Accessible Add alt text and title if you want your images to be conveyed to all users. If the picture is purely decorative, provide at least null alt text (alt=??). Avoid text in images. If it is impossible, make sure that this text is repeated in alt text.