An HTML ‘link’ element in an SVG document (that is, an element in the HTML namespace with local name "link") with its ‘rel’ attribute set to 'stylesheet' must be processed as defined in the HTML specification and cause external style sheets to be loaded and applied to the document.
<link/> tag in the <defs/> section with an xmlns="http://www.w3.org/1999/xhtml".<svg> with a xmlns:html="http://www.w3.org/1999/xhtml" & containing a <html:link/> tag.<style> tag with an @import url() directive.<link/>s in the Inspector and console.debug($0.namespaceURI), I get http://www.w3.org/2000/svg.<link/> tag within a SVG document short of JavaScript?