when authoring document is html or xhtml, it is important to add a doctype declaration. the declaration must be exact (both in spelling and in case) to have the desired effect, which makes it sometimes difficult. to ease the work, below is a list of recommended declarations that you can use in your web documents.
use the following markup as a template to create a new xhtml 1.0 document using a proper doctype. see the list below if you wish to use another document type.
<?xml version="1.0" encoding="utf-8"?><!doctype html public "-//w3c//dtd xhtml 1.0 strict//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head> <title>an xhtml 1.0 strict standard template</title> <meta http-equiv="content-type" content="text/html;charset=utf-8" /> <meta http-equiv="content-style-type" content="text/css" /></head><body> <p>… your html content here …</p></body></html>
<!doctype html public "-//w3c//dtd html 4.01//en" "http://www.w3.org/tr/html4/strict.dtd"><!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"><!doctype html public "-//w3c//dtd html 4.01 frameset//en" "http://www.w3.org/tr/html4/frameset.dtd">
<!doctype html public "-//w3c//dtd xhtml 1.0 strict//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-strict.dtd"><!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd"><!doctype html public "-//w3c//dtd xhtml 1.0 frameset//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-frameset.dtd">
<!doctype html public "-//w3c//dtd xhtml 1.1//en" "http://www.w3.org/tr/xhtml11/dtd/xhtml11.dtd">
<!doctype html public "-//w3c//dtd xhtml basic 1.0//en" "http://www.w3.org/tr/xhtml-basic/xhtml-basic10.dtd">
<!doctype html public "-//w3c//dtd xhtml basic 1.1//en" "http://www.w3.org/tr/xhtml-basic/xhtml-basic11.dtd">
<!doctype html public "-//ietf//dtd html 2.0//en">
<!doctype html public "-//w3c//dtd html 3.2 final//en">
<!doctype math system "http://www.w3.org/math/dtd/mathml1/mathml.dtd">
<!doctype math public "-//w3c//dtd mathml 2.0//en" "http://www.w3.org/tr/mathml2/dtd/mathml2.dtd">
<!doctype html public "-//w3c//dtd xhtml 1.1 plus mathml 2.0 plus svg 1.1//en" "http://www.w3.org/2002/04/xhtml-math-svg/xhtml-math-svg.dtd">
<!doctype svg public "-//w3c//dtd svg 1.0//en" "http://www.w3.org/tr/2001/rec-svg-20010904/dtd/svg10.dtd">
<!doctype svg public "-//w3c//dtd svg 1.1//en" "http://www.w3.org/graphics/svg/1.1/dtd/svg11.dtd">
<!doctype svg public "-//w3c//dtd svg 1.1 basic//en" "http://www.w3.org/graphics/svg/1.1/dtd/svg11-basic.dtd">
<!doctype svg public "-//w3c//dtd svg 1.1 tiny//en" "http://www.w3.org/graphics/svg/1.1/dtd/svg11-tiny.dtd">
<!doctype html public "-//w3c//dtd xhtml 1.1 plus mathml 2.0 plus svg 1.1//en" "http://www.w3.org/2002/04/xhtml-math-svg/xhtml-math-svg.dtd">
<!doctype svg:svg public "-//w3c//dtd xhtml 1.1 plus mathml 2.0 plus svg 1.1//en" "http://www.w3.org/2002/04/xhtml-math-svg/xhtml-math-svg.dtd">
authoring tools must not use the following list.
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