2.1.1 [SVG11] Section 5.10.2, The xml:lang and xml:space attributes


The specification states:

 xml:space = "{default | preserve}" 
 Standard XML attribute to specify whether white space is preserved in character data. The only possible values are 'default' and 'preserve'. 

IE9 Mode, IE10 Mode, IE11 Mode, and EdgeHTML Mode (All Versions)

The xml:space attribute is not supported in SVG.