[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Z] mailto URLs  2nd      defining mail header fields      form data via  <map> tags  2nd  3rd  maps  [See image maps]     image  [See image maps]     standard color  margin-border property  margin collapsing  margin property  margin-left property  margin-right property  margin-top property  marginheight attribute (<frame>)  margins  [See also borders; whitespace]     body content      around CSS boxes      frames      images      marquee areas      style properties for      around table cells  marginwidth attribute (<frame>)  markers  markup metalanguage, XML as  <marquee> tags  masked text-entry fields  mathline descriptor  maxlength attribute     <input type=file>      <input type=text>  mayscript attribute (<applet>)  @media at-rule  media attribute (<style>)  menu lists  <menu> tags  message IDs, news servers  <meta> tags  2nd  3rd  metalanguages, defining computer languages with  method attribute (<form>)  Microsoft Internet Explorer  [See Internet Explorer] Microsoft Word 2000, creating HTML documents with  middle value  [See also alignment]2nd  3rd  MIME types  2nd      application/x-www-form-urlencoded      file-selection controls and      multipart/form-data      multipart/mixed      multipart/x-mixed-replace      text/css      text/plain  missing HTML tags  mix keyword  monitor, form contents and  monospaced text     <code> tags      <kbd> tags      <plaintext> tags      <tt> tags      <var> tags  Mosaic browser  mouse-related events      pseudoclasses for  mouse-sensitive images  [See image maps] movies  [See animation video] MSIE  [See Internet Explorer] <multicol> tags  2nd  multicolumn layout  [See columns] multiline text-entry areas  multimedia  2nd      audio      browser handling of      client-pull feature for      common file formats      GIF animation      images  [See images]     text animation      video, <img> extensions for  multipart/form-data encoding  multipart/mixed encoding  multipart/x-mixed-replace encoding  multiple attribute (<select>)  multiple-choice elements (forms)