The "media" attribute is arguably the only meaningful attribute a
<style> element has within an SVG document. Here we intern the string
"media" in preparation for parsing <style>. Libcss can at least store
the media information even if we decide not to use it.
SVGTINY_STRING_ACTION(fill)
SVGTINY_STRING_ACTION(stroke)
SVGTINY_STRING_ACTION(style)
+SVGTINY_STRING_ACTION(media)
SVGTINY_STRING_ACTION(transform)
SVGTINY_STRING_ACTION(linearGradient)
SVGTINY_STRING_ACTION(href)