XHTML: Differences between Strict & Transitional

Colour coding

• An XHTML1.0 element
• An XHTML1.0 loose element (removed in Strict)
• An XHTML1.0 attribute
• A warning or notice

Elements removed in XHTML Strict

• dir
• menu
• center
• isindex
• applet
• font
• basefont
• s
• strike
• u
• iframe
• noframes

Elements changed in XHTML Strict

head

Element isindex removed in Strict

base

Attribute href changed from implied to required in Strict

Attribute target removed in Strict

link

Attribute target removed in Strict

script

Attribute language removed in Strict

noscript

Elements center, noframes, isindex, menu, dir, a, br, span, bdo, object, applet, img, map, iframe, sub, sup, em, strong, dfn, code, q, samp, kbd, var, cite, abbr, acronym, big, small, font, basefont, tt, i, b, u, s, strike, input, select, textarea, label, button not allowed in Strict

body

Attributes bgcolor, text, link, vlink, alink removed in Strict

Elements center, noframes, isindex, menu, dir, a, br, span, bdo, object, applet, img, map, iframe, sub, sup, em, strong, dfn, code, q, samp, kbd, var, cite, abbr, acronym, big, small, font, basefont, tt, i, b, u, s, strike, input, select, textarea, label, button not allowed in Strict

div

Elements center, noframes, isindex, menu, dir, applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

Attribute align removed in Strict

p

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

Attribute align removed in Strict

h#

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

Attribute align removed in Strict

ul

Attributes type, compact removed in Strict

ol

Attributes type, compact, start removed in Strict

li

Elements center, noframes, isindex, menu, dir, applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

Attributes type, value removed in Strict

dl

Attribute compact removed in Strict

dt

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

dd

Elements center, noframes, isindex, menu, dir, applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

address

Element p removed in Strict

hr

Attributes align, noshade, size, width removed in Strict

pre

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

Elements sup, sub added in Strict.

Error in the DTD? According to a comment in the DTD, pre does not allow sub and sup. However, according to the syntax rules for it, it does allow them. It did NOT allow them in Transitional.

Attribute width removed in Strict

blockquote

Elements center, noframes, isindex, menu, dir, a, br, span, bdo, object, applet, img, map, iframe, sub, sup, em, strong, dfn, code, q, samp, kbd, var, cite, abbr, acronym, big, small, font, basefont, tt, i, b, u, s, strike, input, select, textarea, label, button not allowed in Strict

ins

Elements center, noframes, isindex, menu, dir, applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

del

Elements center, noframes, isindex, menu, dir, applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

a

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

Attribute target removed in Strict

Although the syntax rules prevents the DTD to tell the validator so, a elements may not nest.

span

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

bdo

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

br

Attribute clear removed in Strict

em

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

strong

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

dfn

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

code

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

samp

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

kbd

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

var

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

cite

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

abbr

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

acronym

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

q

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

sub

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

sup

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

tt

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

i

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

b

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

big

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

small

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

object

Elements center, noframes, isindex, menu, dir, applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

Attributes align, border, hspace, vspace removed in Strict

param

Attribute name changed from required to implied in Strict.

img

Attributes name, align, border, hspace, vspace removed in Strict

map

Elements center, noframes, isindex, menu, dir not allowed in Strict

Attribute name removed in Strict

area

Attribute target removed in Strict

form

Elements a, br, span, bdo, object, applet, img, map, iframe, sub, sup, em, strong, dfn, code, q, samp, kbd, var, cite, abbr, acronym, big, small, font, basefont, tt, i, b, u, s, strike, input, select, textarea, label, button not allowed in Strict

Attributes name, target removed in Strict

Although the syntax rules prevents the DTD to tell the validator so, form elements may not nest.

label

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

input

Attribute align removed in Strict

Although the syntax rules prevents the DTD to tell the validator so, the name attribute is required for all input elements except those of the type submit or reset.

fieldset

Elements center, noframes, isindex, menu, dir, applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

Although the syntax rules prevents the DTD to tell the validator so, only one legend element should be placed within the fieldset and that element should only be preceeded by whitespace.

legend

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

button

Elements center, noframes, isindex, menu, dir, iframe, font, basefont, u, s, strike not allowed in Strict

Although the syntax rules prevents the DTD to tell the validator so, the button element may not contain a, form, input, button, textarea, select

table

Attributes bgcolor, align removed in Strict

caption

Elements applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

Attribute align removed in Strict

tr

Attribute bgcolor removed in Strict

th

Elements center, noframes, isindex, menu, dir, applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

Attribute nowrap, bgcolor, width ,height removed in Strict

td

Elements center, noframes, isindex, menu, dir, applet, iframe, big, small, font, basefont, u, s, strike not allowed in Strict

Attribute nowrap, bgcolor, width ,height removed in Strict