html5 Obsolete elements: basefont, big, center, font, s, strike, tt, u, frame, frameset, noframes, align, vlink, alink, text, bgcolor, valign, hspace, etc.
The operating environment of this tutorial: Windows 7 system, HTML5 version, Dell G3 computer.
Category 1: Expressive elements
basefont
big
center
font
s
strike
tt
u
It is recommended to replace them with semantically correct elements and use CSS to ensure the effect after rendering
Second category: frame elements
Due to many usability and accessibility issues with the framework, the HTML5 specification has removed the following elements.
frame
frameset
The third category: attribute class
Many expressive attributes have also been removed by the new specification, as follows:Category 4: Others
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