HTML5 learning notes simplified version (10): obsolete elements and attributes

Discarded Element)

The elements listed in this section will not be used in html5. you can use some alternative solutions to upgrade existing documents to html5. For example, the parser section can process the isindex element.

The reason why the following elements are deprecated is that CSS processing can better replace them:

1. Basefont
2. Big
3. Center
4. Font
5. Strike
6. Tt

The following elements are deprecated because their use destroys usability and accessibility:

1. Frame
2. Frameset
3. Noframes

The reason why the following elements are deprecated is that they are not often used, which can also cause confusion. Other elements can also implement their functions well:

• Acronym is discarded because it often causes page disorder and can be replaced by abbr.
• The applet is discarded because it can be replaced by an object.
• Isindex is discarded because it is replaced by a Form Control.
• Dir is discarded because ul is used instead.

Finally, the noscript element can only be used in HTML, but not in XML.

 

Discarded Attribute)

Some attributes in HTML4 are no longer allowed to be used in html5. the specification details how to deal with existing documents, and these attributes cannot be used in new documents in the future, because they are marked as invalid attributes.

HTML5 specifications have alternative solutions for these attributes. Click to access them.

ID	Corresponding Element	Attribute name
01	Link,	Rev, charset
02	A	Shape, coords
03	Img, iframe	Longdesc
04	Link	Target
05	Area	Nohref
06	Head	Profile
07	Html	Version
08	Img	Name
09	Meta	Scheme
10	Object	Archive, classid, codebase, codetype, declare, standby
11	Param	Valuetype, type
12	Td, th	Axis, abbr
13	Td	Scope
14	Table	Summary

 

In addition, in HTML5, the visual attributes of the following elements will also be discarded, because these functions can be implemented using CSS:

 

ID	Corresponding Element	Attribute name
01	Caption, iframe, img, input, object, legend, table, hr, div, h1, h2, h3, h4, h5, h6, p, col, colgroup, tbody, td, tfoot, th, thead, tr	Align
02	Body	Alink, link, text, vlink
03	Body	Background
04	Table, tr, td, th, body	Bgcolor
05	Object	Border
06	Table	Cellpadding, cellspacing
07	Col, colgroup, tbody, td, tfoot, th, thead, tr	Char, charoff
08	Br	Clear
09	Dl, menu, ol, ul	Compact
10	Table	Frame
11	Iframe	Frameborder
12	Td, th	Height
13	Img, object	Hspace, vspace
14	Iframe	Marginheight, marginwidth
15	Hr	Noshade
16	Td, th	Nowrap
17	Table	Rules
18	Iframe	Scrolling
19	Hr	Size
20	Li, ol, ul	Type
21	Col, colgroup, tbody, td, tfoot, th, thead, tr	Valign
22	Hr, table, td, th, col, colgroup, pre	Width