#data
<button xmlns="http://www.w3.org/1999/xhtml"></button>
#errors
/button;no significant content;s

#data
<button xmlns="http://www.w3.org/1999/xhtml">  </button>
#errors
/button;no significant content;s

#data
<button xmlns="http://www.w3.org/1999/xhtml">xx</button>
#errors

#data
<button xmlns="http://www.w3.org/1999/xhtml"><br/></button>
#errors
/button;no significant content;s

#data
<button xmlns="http://www.w3.org/1999/xhtml"><ins/></button>
#errors
/button;no significant content;s

#data
<button xmlns="http://www.w3.org/1999/xhtml"><em/></button>
#errors
/button;no significant content;s
/button/em;no significant content;s

#data
<button xmlns="http://www.w3.org/1999/xhtml">aa<span>bb</span></button>
#errors

#data
<button xmlns="http://www.w3.org/1999/xhtml"><p/></button>
#errors
/button;no significant content;s
/button/p;no significant content;s
/button/p;element not allowed:phrasing;m

#data
<button xmlns="http://www.w3.org/1999/xhtml"><video src=""/></button>
#errors

#data
<button xmlns="http://www.w3.org/1999/xhtml"><style scoped=""/>x</button>
#errors
/button/style;element not allowed:phrasing;m
/button/style;SUBDOC

#data
<em xmlns="http://www.w3.org/1999/xhtml"><button>x</button></em>
#errors

#data
<em xmlns="http://www.w3.org/1999/xhtml"><button></button></em>
#errors
/em/button;no significant content;s
/em;no significant content;s

#data
<div xmlns="http://www.w3.org/1999/xhtml"><button>x</button></div>
#errors

#data
<ins xmlns="http://www.w3.org/1999/xhtml"><button>x</button></ins>
#errors

#data
<em xmlns="http://www.w3.org/1999/xhtml"><ins><button>x</button></ins></em>
#errors

#data
<br xmlns="http://www.w3.org/1999/xhtml"><button>x</button></br>
#errors
/br/button;element not allowed:empty;m

#data
<title xmlns="http://www.w3.org/1999/xhtml"><button>x</button></title>
#errors
/title/button;element not allowed:text;m

#data
<em xmlns="http://www.w3.org/1999/xhtml"><button>x<nest/></button></em>
#errors
/em/button/nest;element not allowed:phrasing;m
/em/button/nest;element not defined;m

#data
<button xmlns="http://www.w3.org/1999/xhtml"><img src="" alt="x"/></button>
#errors

#data
<button xmlns="http://www.w3.org/1999/xhtml"><span>x</span></button>
#errors

#data
<button xmlns="http://www.w3.org/1999/xhtml"><p>x</p></button>
#errors
/button/p;element not allowed:phrasing;m

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    type=""
>x</button>
#errors
/button/@type;enumerated:invalid;m

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    type="text"
>x</button>
#errors
/button/@type;enumerated:invalid;m

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    type="button"
>x</button>
#errors

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    type="submit"
>x</button>
#errors

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    type="reset"
>x</button>
#errors

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    type="add"
>x</button>
#errors
/button/@type;enumerated:invalid;m

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    type="remove"
>x</button>
#errors
/button/@type;enumerated:invalid;m

#data
<button type="delete" xmlns="http://www.w3.org/1999/xhtml">x</button>
#errors
/button/@type;enumerated:invalid;m

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    type="move-up"
>x</button>
#errors
/button/@type;enumerated:invalid;m

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    type="move-down"
>x</button>
#errors
/button/@type;enumerated:invalid;m

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    type="hidden"
>x</button>
#errors
/button/@type;enumerated:invalid;m

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    type=" submit"
>x</button>
#errors
/button/@type;enumerated:invalid;m

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    type="Submit"
>x</button>
#errors

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    type="RESET"
>x</button>
#errors

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    disabled=""
>x</button>
#errors

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    disabled="disabled"
>x</button>
#errors

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    disabled="DISABLED"
>x</button>
#errors

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    disabled="true"
>x</button>
#errors
/button/@disabled;boolean:invalid;m

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    disabled="enabled"
>x</button>
#errors
/button/@disabled;boolean:invalid;m

#data escaped
<button xmlns="http://www.w3.org/1999/xhtml"
    disabled="d\u0130sabled"
>x</button>
#errors
/button/@disabled;boolean:invalid;m

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    disabled="d\u0131sabled"
>x</button>
#errors
/button/@disabled;boolean:invalid;m

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    autofocus=""
>x</button>
#errors

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    autofocus="autofocus"
>x</button>
#errors

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    autofocus="AutoFocus"
>x</button>
#errors

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    autofocus=" autofocus"
>x</button>
#errors
/button/@autofocus;boolean:invalid;m

#data
<button xmlns="http://www.w3.org/1999/xhtml"
    autofocus="yes"
>x</button>
#errors
/button/@autofocus;boolean:invalid;m

#data
<form xmlns="http://www.w3.org/1999/xhtml"><button
    value=""
>x</button></form>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    action=""
>a</button>
#errors
/button/@action;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    action="http://www.w3.org/"
>a</button>
#errors
/button/@action;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    action="test"
>a</button>
#errors
/button/@action;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    action="#test"
>a</button>
#errors
/button/@action;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    action="[]"
>a</button>
#errors
/button/@action;syntax error:iriref3987;m
/button/@action;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    method=""
>a</button>
#errors
/button/@method;enumerated:invalid;m
/button/@method;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    method="get"
>a</button>
#errors
/button/@method;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    method="GET"
>a</button>
#errors
/button/@method;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    method="post"
>a</button>
#errors
/button/@method;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    method="POST"
>a</button>
#errors
/button/@method;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    method="put"
>a</button>
#errors
/button/@method;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    method="PUT"
>a</button>
#errors
/button/@method;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    method="delete"
>a</button>
#errors
/button/@method;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    method="DELETE"
>a</button>
#errors
/button/@method;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    method="GEt"
>a</button>
#errors
/button/@method;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    method="deleTE"
>a</button>
#errors
/button/@method;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    method="head"
>a</button>
#errors
/button/@method;enumerated:invalid;m
/button/@method;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    method="m-get"
>a</button>
#errors
/button/@method;enumerated:invalid;m
/button/@method;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    method="get "
>a</button>
#errors
/button/@method;enumerated:invalid;m
/button/@method;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    method="getall"
>a</button>
#errors
/button/@method;enumerated:invalid;m
/button/@method;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    method="push"
>a</button>
#errors
/button/@method;enumerated:invalid;m
/button/@method;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    method="method"
>a</button>
#errors
/button/@method;enumerated:invalid;m
/button/@method;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    enctype=""
>a</button>
#errors
/button/@enctype;enumerated:invalid;m
/button/@enctype;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    enctype="application/x-www-form-urlencoded"
>a</button>
#errors
/button/@enctype;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    enctype="APPLICATION/X-WWW-FORM-URLENCODED"
>a</button>
#errors
/button/@enctype;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    enctype="Application/x-www-form-urlencoded"
>a</button>
#errors
/button/@enctype;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    enctype="multipart/form-data"
>a</button>
#errors
/button/@enctype;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    enctype="Multipart/Form-Data"
>a</button>
#errors
/button/@enctype;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    enctype="text/plain"
>a</button>
#errors
/button/@enctype;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    enctype="TEXT/plain"
>a</button>
#errors
/button/@enctype;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    enctype="application/x-url-encoded"
>a</button>
#errors
/button/@enctype;enumerated:invalid;m
/button/@enctype;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    enctype="application/x-sgml-urlencoded"
>a</button>
#errors
/button/@enctype;enumerated:invalid;m
/button/@enctype;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    enctype="application/x-www-form-urlencoded; charset=utf-8"
>a</button>
#errors
/button/@enctype;enumerated:invalid;m
/button/@enctype;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    enctype=" text/plain "
>a</button>
#errors
/button/@enctype;enumerated:invalid;m
/button/@enctype;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    enctype="image/png"
>a</button>
#errors
/button/@enctype;enumerated:invalid;m
/button/@enctype;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    enctype="enctype"
>a</button>
#errors
/button/@enctype;enumerated:invalid;m
/button/@enctype;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    enctype="multipart/related"
>a</button>
#errors
/button/@enctype;enumerated:invalid;m
/button/@enctype;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    enctype="application/xml"
>a</button>
#errors
/button/@enctype;enumerated:invalid;m
/button/@enctype;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    enctype="text/xml"
>a</button>
#errors
/button/@enctype;enumerated:invalid;m
/button/@enctype;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    enctype="text/html"
>a</button>
#errors
/button/@enctype;enumerated:invalid;m
/button/@enctype;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    target=""
>a</button>
#errors
/button/@target;window name:empty;m
/button/@target;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    target="_blank"
>a</button>
#errors
/button/@target;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    target="_self"
>a</button>
#errors
/button/@target;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    target="_parent"
>a</button>
#errors
/button/@target;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    target="_top"
>a</button>
#errors
/button/@target;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    target="new"
>a</button>
#errors
/button/@target;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    target="result"
>a</button>
#errors
/button/@target;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    target="_BLANK"
>a</button>
#errors
/button/@target;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    target="_SElf"
>a</button>
#errors
/button/@target;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    target="_new"
>a</button>
#errors
/button/@target;window name:reserved;m
/button/@target;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    target="_blank "
>a</button>
#errors
/button/@target;window name:reserved;m
/button/@target;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    target="_new window"
>a</button>
#errors
/button/@target;window name:reserved;m
/button/@target;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    target="new window"
>a</button>
#errors
/button/@target;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    target="_content"
>a</button>
#errors
/button/@target;window name:reserved;m
/button/@target;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    target="_replace"
>a</button>
#errors
/button/@target;window name:reserved;m
/button/@target;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    target="_search"
>a</button>
#errors
/button/@target;window name:reserved;m
/button/@target;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    novalidate=""
>a</button>
#errors
/button/@novalidate;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    novalidate="novalidate"
>a</button>
#errors
/button/@novalidate;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    novalidate="NoValidate"
>a</button>
#errors
/button/@novalidate;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    novalidate="yes"
>a</button>
#errors
/button/@novalidate;boolean:invalid;m
/button/@novalidate;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    novalidate="no validate"
>a</button>
#errors
/button/@novalidate;boolean:invalid;m
/button/@novalidate;attribute not defined;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formaction=""
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formaction="http://www.w3.org/"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formaction="test"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formaction="#test"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formaction="[]"
>a</button>
#errors
/button/@formaction;syntax error:iriref3987;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formmethod=""
>a</button>
#errors
/button/@formmethod;enumerated:invalid;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formmethod="get"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formmethod="GET"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formmethod="post"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formmethod="POST"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formmethod="put"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formmethod="PUT"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formmethod="delete"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formmethod="DELETE"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formmethod="GEt"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formmethod="deleTE"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formmethod="head"
>a</button>
#errors
/button/@formmethod;enumerated:invalid;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formmethod="m-get"
>a</button>
#errors
/button/@formmethod;enumerated:invalid;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formmethod="get "
>a</button>
#errors
/button/@formmethod;enumerated:invalid;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formmethod="getall"
>a</button>
#errors
/button/@formmethod;enumerated:invalid;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formmethod="push"
>a</button>
#errors
/button/@formmethod;enumerated:invalid;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formmethod="formmethod"
>a</button>
#errors
/button/@formmethod;enumerated:invalid;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formenctype=""
>a</button>
#errors
/button/@formenctype;enumerated:invalid;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formenctype="application/x-www-form-urlencoded"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formenctype="APPLICATION/X-WWW-FORM-URLENCODED"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formenctype="Application/x-www-form-urlencoded"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formenctype="multipart/form-data"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formenctype="Multipart/Form-Data"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formenctype="text/plain"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formenctype="TEXT/plain"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formenctype="application/x-url-encoded"
>a</button>
#errors
/button/@formenctype;enumerated:invalid;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formenctype="application/x-sgml-urlencoded"
>a</button>
#errors
/button/@formenctype;enumerated:invalid;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formenctype="application/x-www-form-urlencoded; charset=utf-8"
>a</button>
#errors
/button/@formenctype;enumerated:invalid;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formenctype=" text/plain "
>a</button>
#errors
/button/@formenctype;enumerated:invalid;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formenctype="image/png"
>a</button>
#errors
/button/@formenctype;enumerated:invalid;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formenctype="formenctype"
>a</button>
#errors
/button/@formenctype;enumerated:invalid;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formenctype="multipart/related"
>a</button>
#errors
/button/@formenctype;enumerated:invalid;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formenctype="application/xml"
>a</button>
#errors
/button/@formenctype;enumerated:invalid;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formenctype="text/xml"
>a</button>
#errors
/button/@formenctype;enumerated:invalid;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formenctype="text/html"
>a</button>
#errors
/button/@formenctype;enumerated:invalid;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formtarget=""
>a</button>
#errors
/button/@formtarget;window name:empty;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formtarget="_blank"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formtarget="_self"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formtarget="_parent"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formtarget="_top"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formtarget="new"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formtarget="result"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formtarget="_BLANK"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formtarget="_SElf"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formtarget="_new"
>a</button>
#errors
/button/@formtarget;window name:reserved;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formtarget="_blank "
>a</button>
#errors
/button/@formtarget;window name:reserved;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formtarget="_new window"
>a</button>
#errors
/button/@formtarget;window name:reserved;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formtarget="new window"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formtarget="_content"
>a</button>
#errors
/button/@formtarget;window name:reserved;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formtarget="_replace"
>a</button>
#errors
/button/@formtarget;window name:reserved;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formtarget="_search"
>a</button>
#errors
/button/@formtarget;window name:reserved;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formnovalidate=""
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formnovalidate="formnovalidate"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formnovalidate="Formnovalidate"
>a</button>
#errors

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formnovalidate="yes"
>a</button>
#errors
/button/@formnovalidate;boolean:invalid;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formnovalidate="novalidate"
>a</button>
#errors
/button/@formnovalidate;boolean:invalid;m

#data
<button type="submit" xmlns="http://www.w3.org/1999/xhtml"
    formnovalidate="no validate"
>a</button>
#errors
/button/@formnovalidate;boolean:invalid;m

#data
<button xmlns="http://www.w3.org/1999/xhtml">
  aaa
  <input/>
</button>
#errors
/button/input;element not allowed:minus;m

#data
<button xmlns="http://www.w3.org/1999/xhtml">
  aaa
  <input type="hidden"/>
</button>
#errors

#data
<button xmlns="http://www.w3.org/1999/xhtml">
  aaa
  <a href="">bbb</a>
</button>
#errors
/button/a;element not allowed:minus;m