An alt tag can be used to clarify an image. For example, in the form of clear text it is made known what can be seen in an image.
When do you use them?
Using alt tags can add a lot of value to a web page. Alt tags can be a solution, especially for visually impaired visitors. In addition, an alt tag may also show what is actually on an image, if it is not loaded. This is useful when no image is displayed due to technical problems. Alt tags have been used since HTML 2.
It has probably happened to you, you want to visit a web page but the page does not load properly. Often images are not displayed in this case. With the help of an alt tag it can then be announced what is on an image.
In addition, alt tags are used to make websites more functional for the visually impaired. The alt tag is hidden, but appears when you hover the cursor over an image. Alt tags are also read by screen readers.
Of course, the clarity of the alt tag depends on what is shown in an image. When the subject is too abstract or vague, it can be difficult to come up with a correct alt tag.
Improved SEO through alt tags
Alt tags not only make a web page easier to understand for the visually impaired, they also have a positive influence on it SEO . When an image has a subtitle, it does not mean that it is recognized by web crawlers. Often these are overlooked or the title of an image is insufficient. It is especially important that an alt tag is descriptive text. When a web crawler scan a good quality alt tag, this has a positive effect on the ranking of a search engine.
If the term alt tag is unfamiliar to you, you may have heard of an alt attribute. This is officially the correct name for an alt tag. To make sure alt attributes function properly, web professionals often check functionality by using a screen reader. In this way, the experience of visually impaired visitors can be optimized.