Elements that are not allowed in Strict DOCTYPEs
center
font
iframe
strike
u
Attributes not allowed in Strict DOCTYPEs
align (allowed on elements related to tables: col, colgroup, tbody, td, tfoot, th, thead, and tr)
background
bgcolor
border (allowed on table)
height (allowed on img and object)
hspace
language
name (allowed in HTML 4.01 Strict, not allowed on form and img in XHTML 1.0 Strict)
noshade
nowrap
target
text, link, vlink, and alink
vspace
width (allowed on img, object, table, col, and colgroup)
Content model differences
The most important difference in content models between Transitional and Strict is that blockquote, body, and form elements may only contain block level elements. A few examples:
text and images are not allowed immediately inside the body element, and need to be contained in a block level element like p or div
input elements must not be direct descendants of a form element
text in blockquote elements must be wrapped in a block level element like p or div
Elements removed in XHTML Strict
applet
basefont
center
dir
font
iframe
isindex
menu
noframes
s
strike
u
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