Summary of how to use the HTML title attribute correctly

Many novice friends are confused about the two attributes of title and alt. They often use the title attribute to replace the alt attribute of the img element or as the title of the picture, etc. These behaviors are prohibited. Friends who do not understand can refer to Next article If you want to hide something from users using phones, tablets, and assistive technologies, but only show it to keyboard users, then use the title attribute.
Details

There is a problem with the title attribute of HTML itself. The problem is that it doesn't perform well enough in some important ways, even though it has been with us for more than 14 years. With the rise of touch devices, the role of this attribute has further diminished. The accessibility of the title attribute has become a problem due to the lack of browser support, screen reader support and author attention.
The title attribute becomes redundant due to lack of support in the following situations:

For people who access web content information in mobile browsers. Usually the content of the title attribute is displayed as a prompt message in desktop browsers. As far as I know, no mobile browser supports displaying tooltips, and there is no other visual method of accessing the content of the title attribute.
Information for those who cannot use a mouse. Usually the content of the title attribute is displayed as a prompt message in desktop browsers. Although the behavior of prompt information has a history of more than 10 years, no browser has implemented a method of using the keyboard to display the title attribute.
For use on most HTML elements it provides information for people using a variety of assistive technologies. As far as I know, screen readers do not support accessing title attribute information.

The title attribute is not user-friendly as follows

Mobile phone users
Keyboard-only users
Users using screen magnifiers
Screen reader users
Fine motor skill impairments Users
Users with cognitive disabilities

Examples of the title attribute being useful:

Labeling a frame or iframe element:

Provide labels that are displayed under special circumstances that require a program. Directly using visible text labels would be redundant:

Label control in the data table.

Examples where the title attribute is useless or of little use:

Add extra information to links or surrounding content that cannot be text:
newsletter
Instead such information should be part of the link text or next to the link.
Provide the same information as the link text:
newsletter
It is recommended not to copy the link content as the title attribute. This is actually equivalent to doing nothing.
Title used for image:
alt="The castle now has two towers and two walls.">
Probably the title information is the most important information and should be accessible by all users by default. If so, then this content should be right next to the image.
Used to replace the form label, removing the visible text label:

Screen reader users will access the label of the form element, Because the title attribute is included in the attribute name within the accessibility API (which is not supported when text labels use the label element). This is not the case for many other users. It is recommended to include a visible text label whenever possible.
Provide the form element with the same information as the visible label content:
name
Duplicate visible label text is impossible except to add a series of user cognitive noise. Don't do it. Repeating visible label text seems to serve no purpose other than adding a bunch of annoying cognitive noise, stop this usage.
Provide additional directives for form elements:
name
If this directive is important for the correct use of a form element, please provide textual information around the element to ensure that every user can read it.
As an extension of the abbreviation:
W3C
Although the title attribute of the abbr element is supported by screen reader software, using it still is problematic because it is not available to other user groups. It is recommended to provide the full name in text format when the abbreviation first appears in the document, or to provide a glossary of the full name. This is not to say that the title attribute cannot be used, as it has limitations and the full name should be provided in text form.

HTML 5.1 includes general recommendations for using the title attribute:

Reliance on the title attribute is currently discouraged, as many user agents are unable to display this attribute as required by the specification (such as requiring a mouse pointer device to cause the prompt message to be displayed, excluding keyboard-only users and touch screen users)

Using the title attribute instead of the alt attribute of the img element or as the title of an image is prohibited

Relying on the title attribute is currently prohibited due to the weak accessibility support for this attribute by many user agents. ……

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