quirm.net » xhtml http://quirm.net wordpress & web design Fri, 04 May 2012 23:47:52 +0000 en hourly 1 http://wordpress.org/?v=3.3.2 XHTML: Common Validation Errors http://quirm.net/2008/10/02/xhtml-common-validation-errors/ http://quirm.net/2008/10/02/xhtml-common-validation-errors/#comments Thu, 02 Oct 2008 13:16:27 +0000 rich http://quirm.net/?p=213 Unescaped Ampersand ("&")

Example:
<a href="foo.cgi?chapter=1&section=2">...</a>

Possible Validator Report: Unknown entity…

Solution: Always use &amp; in place of &.

Correct Syntax:
<a href="foo.cgi?chapter=1&amp;section=2">...</a>

Incorrect Nesting of Elements

Example:
<strong><em>...</strong></em>

Possible Validator Report: Missing </em> tag

Solution: Elements in XHTML must be closed in the reverse order that they were opened in.

Correct Syntax:
<strong><em>...</em></strong>

Lowercase DOCTYPE

Example:

<!doctype html public "-//w3c//dtd xhtml 1.0 strict//en"
"http://www.w3.org/tr/xhtml1/dtd/xhtml1-strict.dtd" >

Possible Validator Report: Missing DOCTYPE

Solution: The DOCTYPE is case-sensitive so use the correct case.

Correct Syntax::

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd" >

Missing closing " /"

Example:
<img src="image.gif" width="100" height="100" alt="Logo">

Possible Validator Report: Missing closing tag

Solution: So-called "empty elements", such as img,
require a trailing space followed by a "/".

Correct Syntax::
<img src="image.gif" width="100" height="100" alt="Logo" />

Upper case tags

Example:
<STRONG><EM>...</EM></STRONG>

Possible Validator Report: There is no such element…

Solution: Use lower case for all HTML element and attribute names. This difference is necessary because XML is case-sensitive e.g. <em> and <EM> are different tags.

Correct Syntax::
<strong><em>...</em></strong>

Unquoted attribute values

Example:
<td rowspan=3>

Possible Validator Report: Missing " "

Solution: All attribute values must be quoted, even those which appear to be numeric.

Correct Syntax::
<td rowspan="3">

]]> http://quirm.net/2008/10/02/xhtml-common-validation-errors/feed/ 0 XHTML1.0 Elements http://quirm.net/2008/10/02/xhtml10-elements/ http://quirm.net/2008/10/02/xhtml10-elements/#comments Thu, 02 Oct 2008 12:54:04 +0000 rich http://quirm.net/?p=199 Element Strict Transitional Frameset <!--> Yes Yes Yes !DOCTYPE Yes Yes Yes a Yes Yes Yes abbr Yes Yes Yes acronym Yes Yes Yes address Yes Yes Yes applet No Yes Yes area Yes Yes Yes b Yes Yes Yes base Yes Yes Yes basefont No Yes Yes bdo Yes Yes Yes big Yes Yes Yes blockquote Yes Yes Yes body Yes Yes No br Yes Yes Yes button Yes Yes Yes caption Yes Yes Yes center No Yes Yes cite Yes Yes Yes code Yes Yes Yes col Yes Yes Yes colgroup Yes Yes Yes dd Yes Yes Yes del Yes Yes Yes dfn Yes Yes Yes dir No Yes Yes div Yes Yes Yes dl Yes Yes Yes dt Yes Yes Yes em Yes Yes Yes fieldset Yes Yes Yes font No Yes Yes form Yes Yes Yes frame No No Yes frameset No No Yes h1 to h6 Yes Yes Yes head Yes Yes Yes hr Yes Yes Yes html Yes Yes Yes i Yes Yes Yes iframe No Yes Yes img Yes Yes Yes input Yes Yes Yes ins Yes Yes Yes kbd Yes Yes Yes label Yes Yes Yes legend Yes Yes Yes li Yes Yes Yes link Yes Yes Yes map Yes Yes Yes menu No Yes Yes meta Yes Yes Yes noframes No No Yes noscript Yes Yes Yes object Yes Yes Yes ol Yes Yes Yes optgroup Yes Yes Yes option Yes Yes Yes p Yes Yes Yes param Yes Yes Yes pre Yes Yes Yes q Yes Yes Yes s No Yes Yes samp Yes Yes Yes script Yes Yes Yes select Yes Yes Yes small Yes Yes Yes span Yes Yes Yes strike No Yes Yes strong Yes Yes Yes style Yes Yes Yes sub Yes Yes Yes sup Yes Yes Yes table Yes Yes Yes tbody Yes Yes Yes td Yes Yes Yes textarea Yes Yes Yes tfoot Yes Yes Yes th Yes Yes Yes thead Yes Yes Yes title Yes Yes Yes tr Yes Yes Yes tt Yes Yes Yes u No Yes Yes ul Yes Yes Yes var Yes Yes Yes ]]> http://quirm.net/2008/10/02/xhtml10-elements/feed/ 0 XHTML1.0 Attributes http://quirm.net/2008/10/02/xhtml10-attributes/ http://quirm.net/2008/10/02/xhtml10-attributes/#comments Thu, 02 Oct 2008 12:51:00 +0000 rich http://quirm.net/?p=196 Name Related Elements Strict Transitional Frameset abbr td th Yes Yes Yes acronym td th Yes Yes Yes accept-charset form Yes Yes Yes accept form input Yes Yes Yes accesskey a area button input label legend textarea Yes Yes Yes action form Yes Yes Yes align applets Not available Yes Yes align iframe Not available Not available Yes align caption div h1-h6 hr img input legend p table No Yes Yes align col colgroup tbody td tfoot th thead tr Yes Yes Yes alink body No Yes Yes alt applet Not available Yes Yes alt area img input Yes Yes Yes archive applet Not available Yes Yes archive object Yes Yes Yes axis td th Yes Yes Yes background body No Yes Yes bgcolor table tr td th body No Yes Yes border img No Yes Yes border table Yes Yes Yes cellpadding table Yes Yes Yes cellspacing table Yes Yes Yes char col colgroup tbody td tfoot th thead tr Yes Yes Yes charoff col colgroup tbody td tfoot th thead tr Yes Yes Yes charset a link script Yes Yes Yes checked input Yes Yes Yes cite blockquote q del ins Yes Yes Yes class all elements except base basefont head html meta param script style title Yes Yes Yes classid object Yes Yes Yes code applet Not available Yes Yes codebase applet Not available Yes Yes codebase object Yes Yes Yes codetype object Yes Yes Yes color basefont font Not available Yes Yes cols frameset Not available Not available Yes cols textarea Yes Yes Yes colspan td th Yes Yes Yes compact dir dl menu ol ul Not available Yes Yes content meta Yes Yes Yes coords a area Yes Yes Yes data object Yes Yes Yes datetime del ins Yes Yes Yes declare object Yes Yes Yes defer script Yes Yes Yes dir apple basefont Not available Yes Yes dir frame frameset iframe Not available Not available Yes dir all elements except base br param script Yes Yes Yes disabled button input optgroup option select textarea Yes Yes Yes enctype form Yes Yes Yes face basefont font Not available Yes Yes for label Yes Yes Yes frame table Yes Yes Yes frameborder frame iframe Not available Not available Yes headers td th Yes Yes Yes height applet Not available Yes Yes height iframe Not available Not available Yes height td th No Yes Yes height img Yes Yes Yes href a area link base Yes Yes Yes hreflang a link Yes Yes Yes hspace applet Not available Yes Yes hspace img No Yes Yes http-equiv meta Yes Yes Yes id all elements except base head html meta script style title Yes Yes Yes ismap input No Yes Yes ismap img Yes Yes Yes label option optgroup Yes Yes Yes lang applet basefont Not available Yes Yes lang frame frameset iframe Not available Not available Yes lang all elements except base br param script Yes Yes Yes link body No Yes Yes longdesc frame iframe Not available Not available Yes longdesc img Yes Yes Yes marginheight frame iframe Not available Not available Yes marginwidth frame iframe Not available Not available Yes maxlength input Yes Yes Yes media link style Yes Yes Yes method form Yes Yes Yes multiple select Yes Yes Yes name applet Not available Yes Yes name frame iframe Not available Not available Yes name a button input map meta param select textarea Yes Yes Yes nohref area Yes Yes Yes noresize frame Not available Not available Yes noshade hr No Yes Yes nowrap td th No Yes Yes object applet Not available Yes Yes onblur a area button input label select textarea Yes Yes Yes onchange input select textarea Yes Yes Yes onclick applet basefont font Not available Yes Yes onclick frame frameset iframe Not available Not available Yes onclick all elements but base bdo br head html meta param script style title Yes Yes Yes ondblclick applet basefont font Not available Yes Yes ondblclick frame frameset iframe Not available Not available Yes ondblclick all elements but base bdo br head html meta param script style title Yes Yes Yes onfocus a area button input label select textarea Yes Yes Yes onkeydown applet basefont font Not available Yes Yes onkeydown frame frameset iframe Not available Not available Yes onkeydown all elements but base bdo br head html meta param script style title Yes Yes Yes onkeypress applet basefont font Not available Yes Yes onkeypress frame frameset iframe Not available Not available Yes onkeypress all elements but base bdo br head html meta param script style title Yes Yes Yes onkeyup applet basefont font Not available Yes Yes onkeyup frame frameset iframe Not available Not available Yes onkeyup all elements but base bdo br head html meta param script style title Yes Yes Yes onload frameset Not available Not available Yes onload body Yes Yes Yes onmousedown applet basefont font Not available Yes Yes onmousedown frame frameset iframe Not available Not available Yes onmousedown all elements but base bdo br head html meta param script style title Yes Yes Yes onmousemove applet basefont font Not available Yes Yes onmouseout frame frameset iframe Not available Not available Yes onmouseout all elements except base bdo br head html meta param script style title Yes Yes Yes onmouseover applet basefont font Not available Yes Yes onmouseover frame frameset iframe Not available Not available Yes onmouseover all elements but base bdo br head html meta param script style title Yes Yes Yes onmouseup applet basefont font Not available Yes Yes onmouseup frame frameset iframe Not available Not available Yes onmouseup all elements but base bdo br head html meta param script style title Yes Yes Yes onreset form Yes Yes Yes onselect input textarea Yes Yes Yes onsubmit form Yes Yes Yes onunload frameset Not available Not available Yes onunload body Yes Yes Yes profile head Yes Yes Yes readonly input textarea Yes Yes Yes rel a link Yes Yes Yes rev a link Yes Yes Yes rows frameset Not available Not available Yes rows textarea Yes Yes Yes rowspan td th Yes Yes Yes rules table Yes Yes Yes scheme meta Yes Yes Yes scope td th Yes Yes Yes scrolling frame iframe Not available Not available Yes selected option Yes Yes Yes shape a area Yes Yes Yes size basefont font Not available Yes Yes size hr No Yes Yes size input select Yes Yes Yes span col colgroup Yes Yes Yes src frame iframe Not available Not available Yes src img input script Yes Yes Yes standby object Yes Yes Yes start ol No Yes Yes style basefont Not available Yes Yes style all elements but base head html meta param script style title Yes Yes Yes summary table Yes Yes Yes tabindex a area button input select textarea Yes Yes Yes target a No Yes Yes text body No Yes Yes title basefont Not available Yes Yes title all elements but base head html meta param script title Yes Yes Yes type ol ul No Yes Yes type a button form input link object param script style Yes Yes Yes usemap img input Yes Yes Yes valign col colgroup tbody td tfoot th thead tr Yes Yes Yes value button input option param Yes Yes Yes valuetype param Yes Yes Yes version html No Yes Yes vlink body No Yes Yes vspace applet Not available Yes Yes vspace img No Yes Yes width applet Not available Yes Yes width iframe Not available Not available Yes width hr td th No Yes Yes width col colgroup img table Yes Yes Yes ]]> http://quirm.net/2008/10/02/xhtml10-attributes/feed/ 0