What Is an Alt Atribute?

The substitution attribute is a computer network term that refers to a picture used on a web page to describe, and the prompt displayed when the cursor is over the picture is an editing method implemented by using the tag.

Instead of attributes

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The substitution attribute is a computer network term that refers to a picture used on a web page to describe, and the prompt displayed when the cursor is over the picture is an editing method implemented by using the tag.
Chinese name
Instead of attributes
Classification
Network terminology
Alias
ALT- instead of attributes
Features
necessity
Alternative attributes are also called ALT- instead of attributes. ALT strings (for images). Optional text strings added by HTML creators in HTMLIMG tags. This string is used to describe the picture on the web page. The cursor is in the picture. The prompt displayed at the time is implemented by this label.
From the perspective of SEO and user experience, ALT-replacement attributes are necessary, and their importance is mainly:
Relevance of web page content is the premise of keyword optimization. Search engines believe that pictures on web pages should be related to web page themes. Conversely, when search engines want to determine the keywords of a web page, the ALT-replacement attribute of a picture is a trusted reference point. So don't forget to add the keywords of the webpage to the ALT-replacement attribute of the picture.
Sometimes the pictures on the webpage cannot be displayed due to some reasons, such as using a screen reader, low bandwidth, network obstruction, etc. The descriptive ALT-replacement attribute tells the user what the location is about, adding to the user experience. Regular websites should do the same.
Sometimes, if there is no ALT-replacement attribute, users will not understand what the picture represents and why they are placed on this page.
Worse, such as:
<img src = "puppy.jpg" alt = "" />
better
<img src = "puppy.jpg" alt = "dog" />
The best, such as:
<img src = "puppy.jpg" alt = "Dalmatian retrieves prey">
Should be avoided, such as:
<img src = "puppy.jpg" alt = "puppy
Puppy puppies
Labrador retriever wolfhound setter guide dog jack russell terrier
Dog food cheap dog food puppy food "/>
Filling in keywords (keyword stuffing) in the alt attribute can cause a bad user experience and make others think of your site as spam. You should find ways to make informative, useful content that uses keywords appropriately for your specific environment.
The ALT tag is necessary for the following three reasons:
1. When the picture on the website cannot be displayed, the ALT attribute can tell the user what is here, which can improve the user experience. Generally regular websites do this.
2. Sometimes some picture users don't know what to do and why on this page. For example, the RSS icon, although many netizens know that this is subscription information, but many people still do not know.
3. The search engine thinks that the content of the webpage should be relevant, so the pictures on the webpage must be relevant to the theme of the webpage. It can also be said that when a search engine determines the keywords of a web page, the ALT attribute of the picture is a reference point. Therefore, adding the keywords of this page to the ALT attribute of the image can increase the density of the keywords on the page (be careful not to stack them intentionally).

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