internet explorer - How to Interpret HTML + XML without XHTML declaration -

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what type of document.i confused has html 4.0 declaration , contains xml. here structure of document:

    <!doctype html public "-//w3c//dtd html 4.0 frameset//en"> <html>     <head>         <title>container</title>         <link href="css/xyz.css" type="text/css" rel="stylesheet">     </head>     <frameset >         <frameset rows="97%,28" border="0" frameborder="0">             <frame name="main" src="containerinner.htm">             <frame  name="statusbar" src="html/mainstatusbar.htm">         </frameset>         <noframes>             <p>this page requires frames, browser not support them.</p>         </noframes>     </frameset> </html>   <!-- containerinner.htm --> <!doctype html public "-//w3c//dtd html 4.0 transitional//en"> <html> <head>     <title>containerinner</title> </head> <body>     <iframe  name="mainscreen" src="html/loading.htm"></iframe>     <iframe name="menutree" src="html/blankmenu.htm" />     <iframe name="toolbarscreen1" src="html/favouritemenus.htm"></iframe>     <iframe name="taskqueues" src="html\userinfo.htm"></iframe> </body> </html>  <!-- html/loading.htm --> <!-- screen inside iframe mainscreen  --> <?xml version="1.0" ?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/tr/wd-xsl">     <xsl:template match="/">         <html>             <head></head>             <body> </body>         </html>     </xsl:template> </xsl:stylesheet>

i have following questions:

  1. is xhtml document or html.
  2. is legal have multiple doctype declarations above.
  3. will latest version of modern browsers chrome support document has frames.


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