Which HTML global attributes are not truly global attributes?
HTML global attributes refer to attributes that can be used by all HTML elements. Global attributes include class, id, style, title, lang, etc. They can be used by any HTML element to add additional information or control the element's style and behavior. However, not all properties are global properties, and some common properties that are not global properties will be introduced below.
- disabled: The disabled attribute is used to disable the form element so that it cannot be edited or clicked. However, this attribute only applies to specific HTML elements, such as input, button, select, etc. For other elements, such as div, p, img, etc., the disabled attribute is not supported.
- src, alt: The src and alt attributes are mainly used to specify the image source and alternative text in the img element. They are used to display the path to the image and fallback text if the image cannot be displayed. However, these two attributes can only be used within the img element and cannot be applied to other elements.
- href: The href attribute is used to specify the target address of the hyperlink. Although hyperlinks are commonly used elements in HTML, the href attribute can only be applied to a elements (hyperlinks) and area elements (image mapping areas). Other elements such as div, p, etc. do not support the href attribute.
- rows, cols: The rows and cols attributes are used to control the number of text lines and columns in the textarea element. These two properties only apply to textarea elements and not to other elements.
- controls: The controls attribute is used to display the default control panel in the audio (audio) and video (video) elements. However, this attribute can only be used on audio and video elements, not other elements.
- target: The target attribute is used to specify where the hyperlink opens the target window or frame of the link. It can be used for a elements (hyperlinks) and form elements (target windows when submitting forms). However, other elements do not support the target attribute.
To sum up, the attributes listed above are not global attributes of HTML. They only apply to specific HTML elements and cannot be used by all elements. For other elements, using these attributes will be ignored by the browser and will have no effect. Therefore, when using these properties, we need to pay attention to their scope of application to avoid invalid or wrong code.
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