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List of HTML Tags are no longer valid in HTML 5

NameDesceiptionReplacement

<acronym>

Defines an Acronym

<abbr> tag is now used in place of <acronym> tag

<basefont>

Specifies a default color size and font for all text in a document

Completely replaced with CSS properties

<big>

Defines big text

Completely replaced with CSS properties

<center>

Defines the centered text

Completely replaced with CSS properties
<dir>

Defines a directory list

Completely replaced with CSS <ul> tag instead

<font>

Set the font color and size of the text

Completely replaced with CSS properties

<frame>

Defines a frame

Removed from HTML5

<franeset>Defines a set of framesRemoved from HTML5
<inindex>

Defines a single line input field

 
<noframes>

Defines noframe section with alternate content

Removed from HTML5

<s>Redefined tagNow used to define text that is no longer correct
<strike>

Defines strikethrough text

Use <del> or <s> instead.

<tt>

Define teletype text

Completely replaced with CSS properties

<u>Redefined tag

Now represent stylish text such as misspelled or proper nouns in Chinese

<applet>Defines an applet or embedded applet

<embed> or <object> tag now are used

Note: Keep in mind <u> tag was on the list of depreated tags for some time but recently has found it way back into the HTML5 specification. <u> creates the contained text underline.