The alt attribute, also known as the “alt tag” or “alt text,” is an HTML attribute that is used to describe the content of an image on a web page. The alt attribute is important for a number of reasons, including:
Accessibility: The alt attribute helps people with visual impairments access the content of a web page. When a screen reader encounters an image, it reads the alt attribute to the user, allowing them to understand the purpose of the image.
SEO: Search engines use the alt attribute to understand the content of an image and how it relates to the surrounding text. This can help improve the search ranking of a web page.
Fallback: If an image fails to load, the alt attribute will be displayed in place of the image. This can help users understand the purpose of the image and provide context for the surrounding content.
To use the alt attribute, you simply need to add it to the HTML code for an image. For example:
When writing the alt attribute, it’s important to be descriptive but concise. Avoid using phrases like “image of” or “picture of,” and focus on describing the content of the image. For example, if the image is of a cat, the alt attribute might be “a black and white cat sitting on a windowsill.”
In some cases, it may be appropriate to leave the alt attribute empty. This is known as a “null alt attribute.” This is typically used when the image is purely decorative and doesn’t convey any meaningful content.
Overall, the alt attribute is an important tool for improving the accessibility and searchability of a web page. By properly using the alt attribute, you can help ensure that your content is accessible to all users and can be easily discovered by search engines.