2.1.5 [SVG1.1:2011] Section 10.6, The 'tref' element
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The textual content for a ‘text’ can be either character data directly embedded within the ‘text’ element or the character data content of a referenced element, where the referencing is specified with a ‘tref’ element.
IE9 Mode, IE10 Mode, IE11 Mode, and EdgeHTML Mode (All Versions)
The tref element and its attributes are not supported.