Which HTML attributes don't apply to all elements?

HTML, as the basic language for web development, has many attributes that can be used to define elements and control their behavior. Some of the properties are global properties and can be used on any HTML element, while some properties are not global properties and can only be applied to specific elements. This article will introduce some common HTML attributes that are not global attributes.

1. src: This attribute is used to specify the source file address of images, audio, video and other elements. Although this attribute can be used on many elements, it is not a global attribute. It cannot be used in text elements (such as p, span).
2. href: is the attribute used to define hyperlinks. It cannot be used in form elements (such as input, button).
3. type: used to specify the type of input field. Although it can be used in input, button and other elements, it is not a global attribute.
4. alt: Alternative text used to specify image elements. It can only be used within img elements.
5. value: used to define the default value or the value entered by the user. It can be used in input, button and other elements, but it is not a global attribute.
6. disabled: used to disable elements or form fields. It can be used in elements such as buttons and inputs.
7. checked: used to select a selection. It can be used in input[type="radio"], input[type="checkbox"] and other elements.
8. required: Used to set the input field as required. It can be used in input, select and other elements.
9. autofocus: Used to set focus on the specified element after the page is loaded. It can be used in input, button and other elements.
10. placeholder: used to display prompt information when the input field is empty. It can be used in input, textarea and other elements.

In addition to the attributes listed above, there are many HTML attributes that are not global attributes, such as controls, video, audio and other attributes of multimedia elements, colspan, rowspan and other attributes of table elements, etc. These attributes have specific purposes and can help us better control and define the behavior of HTML elements.

In short, it is very important to understand the global nature of HTML attributes, which can help developers better understand and apply these attributes. Although properties that are not global properties have some limitations, they can play an important role on specific elements, providing more options and flexibility for our web page development.

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