Target=_blank: Deprecated. Won't validate.
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Here’s another one the validator will reject: target="_blank". The only way (that I’ve found) around it is to use a little Javascript in the head section. I found this on the web, somewhere:
<script type="text/javascript"> function externalLinks() { if (!document.getElementsByTagName) return; var anchors = document.getElementsByTagName("a"); for (var i=0; i<anchors.length; i++) { var anchor = anchors[i]; if (anchor.getAttribute("href") && anchor.getAttribute("rel") == "external") anchor.target = "_blank"; } } window.onload = externalLinks; </script>
…and then use rel='external' in links, when opening a new browser window is desired.