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Block Level

BODY
P
H1 - H6
PRE
DIV and SPAN (SPAN: HTML 4)
BLOCKQUOTE and Q (Q: HTML 4)
HR
ADDRESS
INS and DEL (HTML 4)
CENTER (Transitional, Frameset and HTML 3.2)

このほかのBlock Level に属する要素について。
HTML 4およびXHTML 1.0 のそれぞれのTransitional, Frameset 及び HTML 3.2 で定義されている、DIR, MENU, ISINDEX については省略します。
HTML 4 Strict では、DIR, MENU は UL で、ISINDEX は INPUT TYPE=text で対応するように求めています。

FORM, FIELDSET については、Forms に載せています。
NOFRAMES については、Frames に載せています。
NOSCRIPT については、Scripts and Objects に載せています。
TABLE については、Tables に載せています。
UL, OL, DL については、Lists に載せています。

BODY

HEAD に続いて書きます。ただし、Frameset では、NOFRAMES の内容となります。

Transitional と Frameset のBODYに関する違いは、内容に NOFRAMES を含めることができるかどうかです。 Frameset の場合は、NOFRAMES を含むことができません。

XHTML 1.0 Strict

<!ENTITY % heading "h1|h2|h3|h4|h5|h6">
<!ENTITY % lists "ul | ol | dl">
<!ENTITY % blocktext "pre | hr | blockquote | address">

<!ENTITY % block
     "p | %heading; | div | %lists; | %blocktext; | fieldset | table">

<!ELEMENT body %Block;>
<!ATTLIST body
  %attrs;
  onload          %Script;   #IMPLIED
  onunload        %Script;   #IMPLIED
  >

HTML 4 Strict

<!ENTITY % heading "H1|H2|H3|H4|H5|H6">
<!ENTITY % list "UL | OL">
<!ENTITY % preformatted "PRE">
<!ENTITY % block
     "P | %heading; | %list; | %preformatted; | DL | DIV | NOSCRIPT |
      BLOCKQUOTE | FORM | HR | TABLE | FIELDSET | ADDRESS">

<!ELEMENT BODY O O (%block;|SCRIPT)+ +(INS|DEL) -- document body -->
<!ATTLIST BODY
  %attrs;                              -- %coreattrs, %i18n, %events --
  onload          %Script;   #IMPLIED  -- the document has been loaded --
  onunload        %Script;   #IMPLIED  -- the document has been removed --
  >

XHTML 1.0 Transitional

<!ELEMENT body %Flow;>
<!ATTLIST body
  %attrs;
  onload      %Script;       #IMPLIED
  onunload    %Script;       #IMPLIED
  background  %URI;          #IMPLIED
  bgcolor     %Color;        #IMPLIED
  text        %Color;        #IMPLIED
  link        %Color;        #IMPLIED
  vlink       %Color;        #IMPLIED
  alink       %Color;        #IMPLIED
  >

XHTML 1.0 Frameset

<!ELEMENT body %Flow;>
<!ATTLIST body
  %attrs;
  onload      %Script;       #IMPLIED
  onunload    %Script;       #IMPLIED
  background  %URI;          #IMPLIED
  bgcolor     %Color;        #IMPLIED
  text        %Color;        #IMPLIED
  link        %Color;        #IMPLIED
  vlink       %Color;        #IMPLIED
  alink       %Color;        #IMPLIED
  >

HTML 4 Transitional and Frameset

Framesetでは、NOFRAMES の定義により、NOFRAMES を内容に含むことはできません。

<!ENTITY % heading "H1|H2|H3|H4|H5|H6">
<!ENTITY % list "UL | OL | DIR | MENU">
<!ENTITY % preformatted "PRE">
<!ENTITY % block 
     "P | %heading; | %list; | %preformatted; | DL | DIV | CENTER |
      NOSCRIPT | NOFRAMES | BLOCKQUOTE | FORM | ISINDEX | HR | TABLE | FIELDSET | ADDRESS">

<!ENTITY % fontstyle "TT | I | B | U | S | STRIKE | BIG | SMALL">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE | ABBR | ACRONYM" >
<!ENTITY % special
   "A | IMG | APPLET | OBJECT | FONT | BASEFONT | BR | SCRIPT |
    MAP | Q | SUB | SUP | SPAN | BDO | IFRAME">
<!ENTITY % formctrl "INPUT | SELECT | TEXTAREA | LABEL | BUTTON">
<!ENTITY % inline "#PCDATA | %fontstyle; | %phrase; | %special; | %formctrl;">

<!ENTITY % flow "%block; | %inline;">

<!ELEMENT BODY O O (%flow;)* +(INS|DEL) -- document body -->
<!ATTLIST BODY
  %attrs;                              -- %coreattrs, %i18n, %events --
  onload          %Script;   #IMPLIED  -- the document has been loaded --
  onunload        %Script;   #IMPLIED  -- the document has been removed --
  background      %URI;      #IMPLIED  -- texture tile for document background --
  %bodycolors;                         -- bgcolor, text, link, vlink, alink --
  >

HTML 3.2

<!ENTITY % heading "H1|H2|H3|H4|H5|H6">

<!ENTITY % font "TT | I | B  | U | STRIKE | BIG | SMALL | SUB | SUP">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE">
<!ENTITY % special "A | IMG | APPLET | FONT | BASEFONT | BR | SCRIPT | MAP">
<!ENTITY % form "INPUT | SELECT | TEXTAREA">
<!ENTITY % text "#PCDATA | %font | %phrase | %special | %form">

<!ENTITY % list "UL | OL |  DIR | MENU">
<!ENTITY % preformatted "PRE">
<!ENTITY % block
     "P | %list | %preformatted | DL | DIV | CENTER |
      BLOCKQUOTE | FORM | ISINDEX | HR | TABLE">

<!ENTITY % body.content "(%heading | %text | %block | ADDRESS)*">

<!ELEMENT BODY O O  %body.content>
<!ATTLIST BODY
        background %URL #IMPLIED  -- texture tile for document background --
        %body-color-attrs;  -- bgcolor, text, link, vlink, alink --
        >

P

段落を構成します。Transitional では、必ずしも必要ないな… 改行目的の空要素の P は書かないよう、w3c は求めています。

XHTML 1.0 Strict

<!ELEMENT p %Inline;>
<!ATTLIST p
  %attrs;
  >

HTML 4 Strict

<!ENTITY % fontstyle "TT | I | B | BIG | SMALL">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE | ABBR | ACRONYM">
<!ENTITY % special "A | IMG | OBJECT | BR | SCRIPT | MAP | Q | SUB | SUP | SPAN | BDO">
<!ENTITY % formctrl "INPUT | SELECT | TEXTAREA | LABEL | BUTTON">

<!ENTITY % inline "#PCDATA | %fontstyle; | %phrase; | %special; | %formctrl;">

<!ELEMENT P - O (%inline;)*            -- paragraph -->
<!ATTLIST P
  %attrs;                              -- %coreattrs, %i18n, %events --
  >

XHTML 1.0 Transitional and Frameset

<!ELEMENT p %Inline;>
<!ATTLIST p
  %attrs;
  %TextAlign;
  >

HTML 4 Transitional and Frameset

<!ENTITY % fontstyle "TT | I | B | U | S | STRIKE | BIG | SMALL">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE | ABBR | ACRONYM" >
<!ENTITY % special
   "A | IMG | APPLET | OBJECT | FONT | BASEFONT | BR | SCRIPT |
    MAP | Q | SUB | SUP | SPAN | BDO | IFRAME">
<!ENTITY % formctrl "INPUT | SELECT | TEXTAREA | LABEL | BUTTON">

<!ENTITY % inline "#PCDATA | %fontstyle; | %phrase; | %special; | %formctrl;">

<!ELEMENT P - O (%inline;)*            -- paragraph -->
<!ATTLIST P
  %attrs;                              -- %coreattrs, %i18n, %events --
  %align;                              -- align, text alignment --
  >

HTML 3.2

<!ENTITY % font "TT | I | B  | U | STRIKE | BIG | SMALL | SUB | SUP">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE">
<!ENTITY % special "A | IMG | APPLET | FONT | BASEFONT | BR | SCRIPT | MAP">
<!ENTITY % form "INPUT | SELECT | TEXTAREA">
<!ENTITY % text "#PCDATA | %font | %phrase | %special | %form">

<!ELEMENT P     - O (%text)*>
<!ATTLIST P
        align  (left|center|right) #IMPLIED
        >

H1 - H6

H1 が最上位の見だし、H6 が最下位の見出しとなります。
H1 H3 H1 の様にとばしてはいけないとする人もいますが、特に規定は無いようです。

XHTML 1.0 Strict

<!ELEMENT h1 %Inline;>
<!ATTLIST h1 %attrs; >

<!ELEMENT h2 %Inline;>
<!ATTLIST h2 %attrs; >

<!ELEMENT h3 %Inline;>
<!ATTLIST h3 %attrs; >

<!ELEMENT h4 %Inline;>
<!ATTLIST h4 %attrs; >

<!ELEMENT h5 %Inline;>
<!ATTLIST h5 %attrs; >

<!ELEMENT h6 %Inline;>
<!ATTLIST h6 %attrs; >

HTML 4 Strict

<!ENTITY % heading "H1|H2|H3|H4|H5|H6">

<!ENTITY % fontstyle "TT | I | B | BIG | SMALL">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE | ABBR | ACRONYM">
<!ENTITY % special "A | IMG | OBJECT | BR | SCRIPT | MAP | Q | SUB | SUP | SPAN | BDO">
<!ENTITY % formctrl "INPUT | SELECT | TEXTAREA | LABEL | BUTTON">

<!ENTITY % inline "#PCDATA | %fontstyle; | %phrase; | %special; | %formctrl;">

<!ELEMENT (%heading;)  - - (%inline;)* -- heading -->
<!ATTLIST (%heading;)
  %attrs;                              -- %coreattrs, %i18n, %events --
  >

XHTML 1.0 Transitional and Frameset


<!ELEMENT h1 %Inline;>
<!ATTLIST h1 
  %attrs;
  %TextAlign;
  >

<!ELEMENT h2 %Inline;>
<!ATTLIST h2
  %attrs;
  %TextAlign;
  >

<!ELEMENT h3 %Inline;>
<!ATTLIST h3
  %attrs;
  %TextAlign;
  >

<!ELEMENT h4 %Inline;>
<!ATTLIST h4
  %attrs;
  %TextAlign;
  >

<!ELEMENT h5 %Inline;>
<!ATTLIST h5
  %attrs;
  %TextAlign;
  >

<!ELEMENT h6 %Inline;>
<!ATTLIST h6
  %attrs;
  %TextAlign;
  >

HTML 4 Transitional and Frameset

<!ENTITY % heading "H1|H2|H3|H4|H5|H6">

<!ENTITY % fontstyle "TT | I | B | U | S | STRIKE | BIG | SMALL">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE | ABBR | ACRONYM" >
<!ENTITY % special
   "A | IMG | APPLET | OBJECT | FONT | BASEFONT | BR | SCRIPT |
    MAP | Q | SUB | SUP | SPAN | BDO | IFRAME">
<!ENTITY % formctrl "INPUT | SELECT | TEXTAREA | LABEL | BUTTON">

<!ENTITY % inline "#PCDATA | %fontstyle; | %phrase; | %special; | %formctrl;">

<!ELEMENT (%heading;)  - - (%inline;)* -- heading -->
<!ATTLIST (%heading;)
  %attrs;                              -- %coreattrs, %i18n, %events --
  %align;                              -- align, text alignment --
  >

HTML 3.2

<!ENTITY % heading "H1|H2|H3|H4|H5|H6">

<!ENTITY % font "TT | I | B  | U | STRIKE | BIG | SMALL | SUB | SUP">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE">
<!ENTITY % special "A | IMG | APPLET | FONT | BASEFONT | BR | SCRIPT | MAP">
<!ENTITY % form "INPUT | SELECT | TEXTAREA">
<!ENTITY % text "#PCDATA | %font | %phrase | %special | %form">

<!ELEMENT ( %heading )  - -  (%text;)*>
<!ATTLIST ( %heading )
        align  (left|center|right) #IMPLIED
        >

PRE

整形済みテキストをあらわします。改行や複数の空白類文字もそのまま表示されます。
TABを何文字の空白で表すかは設定によって変わってしまうため、W3CではTABを含めないよう求めています。

XHTML 1.0 Strict

<!ENTITY % fontstyle "tt | i | b | big | small ">
<!ENTITY % phrase "em | strong | dfn | code | q |
                   samp | kbd | var | cite | abbr | acronym | sub | sup ">
<!ENTITY % special.pre "br | span | bdo | map">

<!-- these can occur at block or inline level -->
<!ENTITY % misc.inline "ins | del | script">
<!ENTITY % inline.forms "input | select | textarea | label | button">

<!-- pre uses %Inline excluding big, small, sup or sup -->
<!ENTITY % pre.content
   "(#PCDATA | a | %fontstyle; | %phrase; | %special.pre; | %misc.inline;
      | %inline.forms;)*">

<!ELEMENT pre %pre.content;>
<!ATTLIST pre
  %attrs;
  xml:space (preserve) #FIXED 'preserve'
  >

HTML 4 Strict

<!ENTITY % fontstyle "TT | I | B | BIG | SMALL">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE | ABBR | ACRONYM">
<!ENTITY % special "A | IMG | OBJECT | BR | SCRIPT | MAP | Q | SUB | SUP | SPAN | BDO">
<!ENTITY % formctrl "INPUT | SELECT | TEXTAREA | LABEL | BUTTON">
<!ENTITY % inline "#PCDATA | %fontstyle; | %phrase; | %special; | %formctrl;">

<!ENTITY % pre.exclusion "IMG|OBJECT|BIG|SMALL|SUB|SUP">

<!ELEMENT PRE - - (%inline;)* -(%pre.exclusion;) -- preformatted text -->
<!ATTLIST PRE
  %attrs;                              -- %coreattrs, %i18n, %events --
  >

XHTML 1.0 Transitional and Frameset

<!ENTITY % special.basic "br | span | bdo">
<!ENTITY % fontstyle.basic "tt | i | b | u | s | strike ">
<!ENTITY % phrase.basic "em | strong | dfn | code | q |
                   samp | kbd | var | cite | abbr | acronym">
<!ENTITY % inline.forms "input | select | textarea | label | button">

<!-- these can occur at block or inline level -->
<!ENTITY % misc.inline "ins | del | script">

<!-- pre uses %Inline excluding img, object, applet, big, small, sub, sup, font, or basefont -->
<!ENTITY % pre.content
   "(#PCDATA | a | %special.basic; | %fontstyle.basic; | %phrase.basic; |
      %inline.forms; | %misc.inline;)*">

<!ELEMENT pre %pre.content;>
<!ATTLIST pre
  %attrs;
  width       %Number;      #IMPLIED
  xml:space   (preserve)    #FIXED 'preserve'
  >

HTML 4 Transitional and Frameset

<!ENTITY % fontstyle "TT | I | B | U | S | STRIKE | BIG | SMALL">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE | ABBR | ACRONYM" >
<!ENTITY % special
   "A | IMG | APPLET | OBJECT | FONT | BASEFONT | BR | SCRIPT |
    MAP | Q | SUB | SUP | SPAN | BDO | IFRAME">
<!ENTITY % formctrl "INPUT | SELECT | TEXTAREA | LABEL | BUTTON">
<!ENTITY % inline "#PCDATA | %fontstyle; | %phrase; | %special; | %formctrl;">

<!ENTITY % pre.exclusion "IMG|OBJECT|APPLET|BIG|SMALL|SUB|SUP|FONT|BASEFONT">

<!ELEMENT PRE - - (%inline;)* -(%pre.exclusion;) -- preformatted text -->
<!ATTLIST PRE
  %attrs;                              -- %coreattrs, %i18n, %events --
  width       NUMBER         #IMPLIED
  >

HTML 3.2

<!ENTITY % font "TT | I | B  | U | STRIKE | BIG | SMALL | SUB | SUP">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE">
<!ENTITY % special "A | IMG | APPLET | FONT | BASEFONT | BR | SCRIPT | MAP">
<!ENTITY % form "INPUT | SELECT | TEXTAREA">
<!ENTITY % text "#PCDATA | %font | %phrase | %special | %form">

<!ENTITY % pre.exclusion "IMG|BIG|SMALL|SUB|SUP|FONT">

<!ELEMENT PRE - - (%text)* -(%pre.exclusion)>
<!ATTLIST PRE
        width NUMBER #implied -- is this widely supported? --
        >

DIV and SPAN

文書に構造的な意味を補強します。表示に取り決めはないので、stylesheet などで指定します。
Block Level の構造は、DIV を利用します。Inline Level の構造は、SPAN を利用します。
SPAN は、HTML 3.2 には存在しません。

XHTML 1.0 Strict

<!ELEMENT div %Flow;>  <!-- generic language/style container -->
<!ATTLIST div
  %attrs;
  >

<!ELEMENT span %Inline;> <!-- generic language/style container -->
<!ATTLIST span
  %attrs;
  >

HTML 4 Strict

<!ENTITY % heading "H1|H2|H3|H4|H5|H6">
<!ENTITY % list "UL | OL">
<!ENTITY % preformatted "PRE">
<!ENTITY % block
     "P | %heading; | %list; | %preformatted; | DL | DIV | NOSCRIPT |
      BLOCKQUOTE | FORM | HR | TABLE | FIELDSET | ADDRESS">

<!ENTITY % fontstyle "TT | I | B | BIG | SMALL">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE | ABBR | ACRONYM">
<!ENTITY % special "A | IMG | OBJECT | BR | SCRIPT | MAP | Q | SUB | SUP | SPAN | BDO">
<!ENTITY % formctrl "INPUT | SELECT | TEXTAREA | LABEL | BUTTON">
<!ENTITY % inline "#PCDATA | %fontstyle; | %phrase; | %special; | %formctrl;">

<!ENTITY % flow "%block; | %inline;">

<!ELEMENT DIV - - (%flow;)*            -- generic language/style container -->
<!ATTLIST DIV
  %attrs;                              -- %coreattrs, %i18n, %events --
  %reserved;                           -- reserved for possible future use --
  >

<!ELEMENT SPAN - - (%inline;)*         -- generic language/style container -->
<!ATTLIST SPAN
  %attrs;                              -- %coreattrs, %i18n, %events --
  %reserved;                           -- reserved for possible future use --
  >

XHTML 1.0 Transitional

<!ELEMENT div %Flow;>  <!-- generic language/style container -->
<!ATTLIST div
  %attrs;
  %TextAlign;
  >

<!ELEMENT span %Inline;> <!-- generic language/style container -->
<!ATTLIST span
  %attrs;
  >

XHTML 1.0 Frameset

<!ELEMENT div %Flow;>  <!-- generic language/style container -->
<!ATTLIST div
  %attrs;
  %TextAlign;
  >

<!ELEMENT span %Inline;> <!-- generic language/style container -->
<!ATTLIST span
  %attrs;
  >

HTML 4 Transitional and Frameset

<!ENTITY % heading "H1|H2|H3|H4|H5|H6">
<!ENTITY % list "UL | OL | DIR | MENU">
<!ENTITY % preformatted "PRE">
<!ENTITY % block 
     "P | %heading; | %list; | %preformatted; | DL | DIV | CENTER |
      NOSCRIPT | NOFRAMES | BLOCKQUOTE | FORM | ISINDEX | HR | TABLE | FIELDSET | ADDRESS">

<!ENTITY % fontstyle "TT | I | B | U | S | STRIKE | BIG | SMALL">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE | ABBR | ACRONYM" >
<!ENTITY % special
   "A | IMG | APPLET | OBJECT | FONT | BASEFONT | BR | SCRIPT |
    MAP | Q | SUB | SUP | SPAN | BDO | IFRAME">
<!ENTITY % formctrl "INPUT | SELECT | TEXTAREA | LABEL | BUTTON">
<!ENTITY % inline "#PCDATA | %fontstyle; | %phrase; | %special; | %formctrl;">

<!ENTITY % flow "%block; | %inline;">

<!ELEMENT DIV - - (%flow;)*            -- generic language/style container -->
<!ATTLIST DIV
  %attrs;                              -- %coreattrs, %i18n, %events --
  %align;                              -- align, text alignment --
  %reserved;                           -- reserved for possible future use --
  >

<!ELEMENT SPAN - - (%inline;)*         -- generic language/style container -->
<!ATTLIST SPAN
  %attrs;                              -- %coreattrs, %i18n, %events --
  %reserved;                           -- reserved for possible future use --
  >

HTML 3.2

<!ENTITY % heading "H1|H2|H3|H4|H5|H6">

<!ENTITY % font "TT | I | B  | U | STRIKE | BIG | SMALL | SUB | SUP">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE">
<!ENTITY % special "A | IMG | APPLET | FONT | BASEFONT | BR | SCRIPT | MAP">
<!ENTITY % form "INPUT | SELECT | TEXTAREA">
<!ENTITY % text "#PCDATA | %font | %phrase | %special | %form">

<!ENTITY % list "UL | OL |  DIR | MENU">
<!ENTITY % preformatted "PRE">
<!ENTITY % block
     "P | %list | %preformatted | DL | DIV | CENTER |
      BLOCKQUOTE | FORM | ISINDEX | HR | TABLE">

<!ENTITY % body.content "(%heading | %text | %block | ADDRESS)*">

<!ELEMENT DIV - - %body.content>
<!ATTLIST DIV
        align   (left|center|right) #IMPLIED -- alignment of following text --
        >

BLOCKQUOTE and Q

引用を意味します。一般に字下げされますが、その目的で使うことは意図されていません。
Block Level での引用は、BLOCKQUOTE を利用します。Inline Level での引用は、Q を利用します。
Q は、HTML 3.2 には存在しません。

XHTML 1.0 Strict


<!ENTITY % heading "h1|h2|h3|h4|h5|h6">
<!ENTITY % lists "ul | ol | dl">
<!ENTITY % blocktext "pre | hr | blockquote | address">

<!ENTITY % block
     "p | %heading; | div | %lists; | %blocktext; | fieldset | table">

<!-- these can occur at block or inline level -->
<!ENTITY % misc.inline "ins | del | script">

<!-- these can only occur at block level -->
<!ENTITY % misc "noscript | %misc.inline;">

<!ENTITY % Block "(%block; | form | %misc;)*">

<!ELEMENT blockquote %Block;>
<!ATTLIST blockquote
  %attrs;
  cite        %URI;          #IMPLIED
  >

<!ELEMENT q %Inline;>   <!-- inlined quote -->
<!ATTLIST q
  %attrs;
  cite        %URI;          #IMPLIED
  >

HTML 4 Strict

<!ENTITY % heading "H1|H2|H3|H4|H5|H6">
<!ENTITY % list "UL | OL">
<!ENTITY % preformatted "PRE">
<!ENTITY % block
     "P | %heading; | %list; | %preformatted; | DL | DIV | NOSCRIPT |
      BLOCKQUOTE | FORM | HR | TABLE | FIELDSET | ADDRESS">

<!ELEMENT BLOCKQUOTE - - (%block;|SCRIPT)+ -- long quotation -->
<!ATTLIST BLOCKQUOTE
  %attrs;                              -- %coreattrs, %i18n, %events --
  cite        %URI;          #IMPLIED  -- URI for source document or msg --
  >

<!ENTITY % fontstyle "TT | I | B | BIG | SMALL">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE | ABBR | ACRONYM">
<!ENTITY % special "A | IMG | OBJECT | BR | SCRIPT | MAP | Q | SUB | SUP | SPAN | BDO">
<!ENTITY % formctrl "INPUT | SELECT | TEXTAREA | LABEL | BUTTON">
<!ENTITY % inline "#PCDATA | %fontstyle; | %phrase; | %special; | %formctrl;">

<!ELEMENT Q - - (%inline;)*            -- short inline quotation -->
<!ATTLIST Q
  %attrs;                              -- %coreattrs, %i18n, %events --
  cite        %URI;          #IMPLIED  -- URI for source document or msg --
  >

XHTML 1.0 Transitional

<!ELEMENT blockquote %Flow;>
<!ATTLIST blockquote
  %attrs;
  cite        %URI;          #IMPLIED
  >

<!ELEMENT q %Inline;>   <!-- inlined quote -->
<!ATTLIST q
  %attrs;
  cite        %URI;          #IMPLIED
  >

XHTML 1.0 Frameset

<!ELEMENT blockquote %Flow;>
<!ATTLIST blockquote
  %attrs;
  cite        %URI;          #IMPLIED
  >

<!ELEMENT q %Inline;>   <!-- inlined quote -->
<!ATTLIST q
  %attrs;
  cite        %URI;          #IMPLIED
  >

HTML 4 Transitional and Frameset

<!ENTITY % heading "H1|H2|H3|H4|H5|H6">
<!ENTITY % list "UL | OL | DIR | MENU">
<!ENTITY % preformatted "PRE">
<!ENTITY % block 
     "P | %heading; | %list; | %preformatted; | DL | DIV | CENTER |
      NOSCRIPT | NOFRAMES | BLOCKQUOTE | FORM | ISINDEX | HR | TABLE | FIELDSET | ADDRESS">

<!ENTITY % fontstyle "TT | I | B | U | S | STRIKE | BIG | SMALL">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE | ABBR | ACRONYM" >
<!ENTITY % special
   "A | IMG | APPLET | OBJECT | FONT | BASEFONT | BR | SCRIPT |
    MAP | Q | SUB | SUP | SPAN | BDO | IFRAME">
<!ENTITY % formctrl "INPUT | SELECT | TEXTAREA | LABEL | BUTTON">
<!ENTITY % inline "#PCDATA | %fontstyle; | %phrase; | %special; | %formctrl;">

<!ENTITY % flow "%block; | %inline;">

<!ELEMENT BLOCKQUOTE - - (%flow;)*     -- long quotation -->
<!ATTLIST BLOCKQUOTE
  %attrs;                              -- %coreattrs, %i18n, %events --
  cite        %URI;          #IMPLIED  -- URI for source document or msg --
  >

<!ELEMENT Q - - (%inline;)*            -- short inline quotation -->
<!ATTLIST Q
  %attrs;                              -- %coreattrs, %i18n, %events --
  cite        %URI;          #IMPLIED  -- URI for source document or msg --
  >

HTML 3.2

<!ENTITY % heading "H1|H2|H3|H4|H5|H6">

<!ENTITY % font "TT | I | B  | U | STRIKE | BIG | SMALL | SUB | SUP">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE">
<!ENTITY % special "A | IMG | APPLET | FONT | BASEFONT | BR | SCRIPT | MAP">
<!ENTITY % form "INPUT | SELECT | TEXTAREA">
<!ENTITY % text "#PCDATA | %font | %phrase | %special | %form">

<!ENTITY % list "UL | OL |  DIR | MENU">
<!ENTITY % preformatted "PRE">
<!ENTITY % block
     "P | %list | %preformatted | DL | DIV | CENTER |
      BLOCKQUOTE | FORM | ISINDEX | HR | TABLE">

<!ENTITY % body.content "(%heading | %text | %block | ADDRESS)*">

<!ELEMENT BLOCKQUOTE - - %body.content>

HR

水平な線を表示します。この上にある、横に長い線のことです。
ちなみに、語源(?)はよく書籍にある水平線(Horizontal Line)ではなく、Horizontal Rule です。

XHTML 1.0 Strict

<!ELEMENT hr EMPTY>
<!ATTLIST hr
  %attrs;
  >

HTML 4 Strict

<!ELEMENT HR - O EMPTY -- horizontal rule -->
<!ATTLIST HR
  %coreattrs;                          -- id, class, style, title --
  %events;
  >

XHTML 1.0 Transitional and Frameset

<!ELEMENT hr EMPTY>
<!ATTLIST hr
  %attrs;
  align       (left|center|right) #IMPLIED
  noshade     (noshade)      #IMPLIED
  size        %Pixels;       #IMPLIED
  width       %Length;       #IMPLIED
  >

HTML 4 Transitional and Frameset

<!ELEMENT HR - O EMPTY -- horizontal rule -->
<!ATTLIST HR
  %coreattrs;                          -- id, class, style, title --
  %events;
  align       (left|center|right) #IMPLIED
  noshade     (noshade)      #IMPLIED
  size        %Pixels;       #IMPLIED
  width       %Length;       #IMPLIED
  >

HTML 3.2

<!ELEMENT HR    - O EMPTY>
<!ATTLIST HR
        align (left|right|center) #IMPLIED
        noshade (noshade) #IMPLIED
        size  %Pixels #IMPLIED
        width %Length #IMPLIED
        >

ADDRESS

作者の連絡先を表します。

XHTML 1.0 Strict


<!ELEMENT address %Inline;>
<!ATTLIST address
  %attrs;
  >

HTML 4 Strict

<!ENTITY % fontstyle "TT | I | B | BIG | SMALL">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE | ABBR | ACRONYM">
<!ENTITY % special "A | IMG | OBJECT | BR | SCRIPT | MAP | Q | SUB | SUP | SPAN | BDO">
<!ENTITY % formctrl "INPUT | SELECT | TEXTAREA | LABEL | BUTTON">
<!ENTITY % inline "#PCDATA | %fontstyle; | %phrase; | %special; | %formctrl;">

<!ELEMENT ADDRESS - - (%inline;)* -- information on author -->
<!ATTLIST ADDRESS
  %attrs;                              -- %coreattrs, %i18n, %events --
  >

XHTML 1.0 Transitional and Frameset


<!ENTITY % special.extra "object | applet | img | map | iframe">
<!ENTITY % special.basic "br | span | bdo">
<!ENTITY % special "%special.basic; | %special.extra;">

<!ENTITY % fontstyle.extra "big | small | font | basefont">
<!ENTITY % fontstyle.basic "tt | i | b | u | s | strike ">
<!ENTITY % fontstyle "%fontstyle.basic; | %fontstyle.extra;">

<!ENTITY % phrase.extra "sub | sup">
<!ENTITY % phrase.basic "em | strong | dfn | code | q |
                   samp | kbd | var | cite | abbr | acronym">
<!ENTITY % phrase "%phrase.basic; | %phrase.extra;">

<!ENTITY % inline.forms "input | select | textarea | label | button">

<!ENTITY % inline "a | %special; | %fontstyle; | %phrase; | %inline.forms;">

<!-- these can occur at block or inline level -->
<!ENTITY % misc.inline "ins | del | script">

<!ELEMENT address (#PCDATA | %inline; | %misc.inline; | p)*>
<!ATTLIST address
  %attrs;
  >

HTML 4 Transitional and Frameset

<!ENTITY % fontstyle "TT | I | B | U | S | STRIKE | BIG | SMALL">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE | ABBR | ACRONYM" >
<!ENTITY % special
   "A | IMG | APPLET | OBJECT | FONT | BASEFONT | BR | SCRIPT |
    MAP | Q | SUB | SUP | SPAN | BDO | IFRAME">
<!ENTITY % formctrl "INPUT | SELECT | TEXTAREA | LABEL | BUTTON">
<!ENTITY % inline "#PCDATA | %fontstyle; | %phrase; | %special; | %formctrl;">

<!ELEMENT ADDRESS - - ((%inline;)|P)*  -- information on author -->
<!ATTLIST ADDRESS
  %attrs;                              -- %coreattrs, %i18n, %events --
  >

HTML 3.2

<!ENTITY % font "TT | I | B  | U | STRIKE | BIG | SMALL | SUB | SUP">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE">
<!ENTITY % special "A | IMG | APPLET | FONT | BASEFONT | BR | SCRIPT | MAP">
<!ENTITY % form "INPUT | SELECT | TEXTAREA">
<!ENTITY % text "#PCDATA | %font | %phrase | %special | %form">

<!ENTITY % address.content "((%text;) | P)*">

<!ELEMENT ADDRESS - - %address.content>

INS and DEL

文書の変更を明示します。INS 要素には変更後の、DEL 要素には変更前の内容が入ります。
block にも、inline にもなりえますが、同時にその2つとなることはできません。 block levelの内容を含むならば INS,DELは block level、そうでなければinlineというのが私の解釈ですけど、正しいかどうかはよく分からん…

XHTML 1.0 Strict

<!ELEMENT ins %Flow;>
<!ATTLIST ins
  %attrs;
  cite        %URI;          #IMPLIED
  datetime    %Datetime;     #IMPLIED
  >

<!ELEMENT del %Flow;>
<!ATTLIST del
  %attrs;
  cite        %URI;          #IMPLIED
  datetime    %Datetime;     #IMPLIED
  >

HTML 4 Strict

<!ENTITY % heading "H1|H2|H3|H4|H5|H6">
<!ENTITY % list "UL | OL">
<!ENTITY % preformatted "PRE">
<!ENTITY % block
     "P | %heading; | %list; | %preformatted; | DL | DIV | NOSCRIPT |
      BLOCKQUOTE | FORM | HR | TABLE | FIELDSET | ADDRESS">

<!ENTITY % fontstyle "TT | I | B | BIG | SMALL">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE | ABBR | ACRONYM">
<!ENTITY % special "A | IMG | OBJECT | BR | SCRIPT | MAP | Q | SUB | SUP | SPAN | BDO">
<!ENTITY % formctrl "INPUT | SELECT | TEXTAREA | LABEL | BUTTON">
<!ENTITY % inline "#PCDATA | %fontstyle; | %phrase; | %special; | %formctrl;">

<!ENTITY % flow "%block; | %inline;">

<!ELEMENT (INS|DEL) - - (%flow;)*      -- inserted text, deleted text -->
<!ATTLIST (INS|DEL)
  %attrs;                              -- %coreattrs, %i18n, %events --
  cite        %URI;          #IMPLIED  -- info on reason for change --
  datetime    %Datetime;     #IMPLIED  -- date and time of change --
  >

XHTML 1.0 Transitional

<!ELEMENT ins %Flow;>
<!ATTLIST ins
  %attrs;
  cite        %URI;          #IMPLIED
  datetime    %Datetime;     #IMPLIED
  >

<!ELEMENT del %Flow;>
<!ATTLIST del
  %attrs;
  cite        %URI;          #IMPLIED
  datetime    %Datetime;     #IMPLIED
  >

XHTML 1.0 Frameset

<!ELEMENT ins %Flow;>
<!ATTLIST ins
  %attrs;
  cite        %URI;          #IMPLIED
  datetime    %Datetime;     #IMPLIED
  >

<!ELEMENT del %Flow;>
<!ATTLIST del
  %attrs;
  cite        %URI;          #IMPLIED
  datetime    %Datetime;     #IMPLIED
  >

HTML 4 Transitional and Frameset

<!ENTITY % heading "H1|H2|H3|H4|H5|H6">
<!ENTITY % list "UL | OL | DIR | MENU">
<!ENTITY % preformatted "PRE">
<!ENTITY % block 
     "P | %heading; | %list; | %preformatted; | DL | DIV | CENTER |
      NOSCRIPT | NOFRAMES | BLOCKQUOTE | FORM | ISINDEX | HR | TABLE | FIELDSET | ADDRESS">

<!ENTITY % fontstyle "TT | I | B | U | S | STRIKE | BIG | SMALL">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE | ABBR | ACRONYM" >
<!ENTITY % special
   "A | IMG | APPLET | OBJECT | FONT | BASEFONT | BR | SCRIPT |
    MAP | Q | SUB | SUP | SPAN | BDO | IFRAME">
<!ENTITY % formctrl "INPUT | SELECT | TEXTAREA | LABEL | BUTTON">
<!ENTITY % inline "#PCDATA | %fontstyle; | %phrase; | %special; | %formctrl;">

<!ENTITY % flow "%block; | %inline;">

<!ELEMENT (INS|DEL) - - (%flow;)*      -- inserted text, deleted text -->
<!ATTLIST (INS|DEL)
  %attrs;                              -- %coreattrs, %i18n, %events --
  cite        %URI;          #IMPLIED  -- info on reason for change --
  datetime    %Datetime;     #IMPLIED  -- date and time of change --
  >

HTML 3.2
含まれていません。

CENTER

<DIV align=center> の省略形です。Strict DTD には、含まれていません。

XHTML 1.0 Strict
含まれていません。
HTML 4 Strict
含まれていません。

XHTML 1.0 Transitional

<!ELEMENT center %Flow;>
<!ATTLIST center
  %attrs;
  >

XHTML 1.0 Frameset

<!ELEMENT center %Flow;>
<!ATTLIST center
  %attrs;
  >

HTML 4 Transitional and Frameset

<!ENTITY % heading "H1|H2|H3|H4|H5|H6">
<!ENTITY % list "UL | OL | DIR | MENU">
<!ENTITY % preformatted "PRE">
<!ENTITY % block 
     "P | %heading; | %list; | %preformatted; | DL | DIV | CENTER |
      NOSCRIPT | NOFRAMES | BLOCKQUOTE | FORM | ISINDEX | HR | TABLE | FIELDSET | ADDRESS">

<!ENTITY % fontstyle "TT | I | B | U | S | STRIKE | BIG | SMALL">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE | ABBR | ACRONYM" >
<!ENTITY % special
   "A | IMG | APPLET | OBJECT | FONT | BASEFONT | BR | SCRIPT |
    MAP | Q | SUB | SUP | SPAN | BDO | IFRAME">
<!ENTITY % formctrl "INPUT | SELECT | TEXTAREA | LABEL | BUTTON">
<!ENTITY % inline "#PCDATA | %fontstyle; | %phrase; | %special; | %formctrl;">

<!ENTITY % flow "%block; | %inline;">

<!ELEMENT CENTER - - (%flow;)*         -- shorthand for DIV align=center -->
<!ATTLIST CENTER
  %attrs;                              -- %coreattrs, %i18n, %events --
  >

HTML 3.2

<!ENTITY % heading "H1|H2|H3|H4|H5|H6">

<!ENTITY % font "TT | I | B  | U | STRIKE | BIG | SMALL | SUB | SUP">
<!ENTITY % phrase "EM | STRONG | DFN | CODE | SAMP | KBD | VAR | CITE">
<!ENTITY % special "A | IMG | APPLET | FONT | BASEFONT | BR | SCRIPT | MAP">
<!ENTITY % form "INPUT | SELECT | TEXTAREA">
<!ENTITY % text "#PCDATA | %font | %phrase | %special | %form">

<!ENTITY % list "UL | OL |  DIR | MENU">
<!ENTITY % preformatted "PRE">
<!ENTITY % block
     "P | %list | %preformatted | DL | DIV | CENTER |
      BLOCKQUOTE | FORM | ISINDEX | HR | TABLE">

<!ENTITY % body.content "(%heading | %text | %block | ADDRESS)*">

<!ELEMENT center - - %body.content>

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