A note if users run into this: some IE conditionals, like these from the HTML 5 Boilerplate Project
<!--[if lt IE 7]>
<html class="no-js lt-ie9 lt-ie8 lt-ie7"> <![endif]-->
<!--[if IE 7]>
<html class="no-js lt-ie9 lt-ie8"> <![endif]-->
<!--[if IE 8]>
<html class="no-js lt-ie9"> <![endif]-->
<!--[if gt IE 8]><!--><!--<![endif]-->
can cause problems with some aspects of Percussion and our DTS content. If you need to add something like this, you also need to incorporate our default DOCTYPE code, maybe like this:
<!--[if lt IE 7]>
<html class="no-js lt-ie9 lt-ie8 lt-ie7" xmlns="http://www.w3.org/1999/xhtml" <br /> xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" <br /> xmlns:dcterms="http://purl.org/dc/terms/" <br /> xmlns:perc="http://percussion.com/" <br /> xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <![endif]-->
<!--[if IE 7]>
<html class="no-js lt-ie9 lt-ie8" xmlns="http://www.w3.org/1999/xhtml" <br /> xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" <br /> xmlns:dcterms="http://purl.org/dc/terms/" <br /> xmlns:perc="http://percussion.com/" <br /> xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <![endif]-->
<!--[if IE 8]>
<html class="no-js lt-ie9" xmlns="http://www.w3.org/1999/xhtml" <br /> xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" <br /> xmlns:dcterms="http://purl.org/dc/terms/" <br /> xmlns:perc="http://percussion.com/" <br /> xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <![endif]-->
<!--[if gt IE 8]><!-->
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:dcterms="http://purl.org/dc/terms/"
xmlns:perc="http://percussion.com/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"\> <!--<![endif]-->