<p>So it was OK until I updated zoomslider to fix IE8 which also pulled in <a href="https://github.com/kartena/Leaflet.zoomslider/commit/40adeee18cb50856944bea7e9fb7c99d19b81b94" class="commit-link">kartena/Leaflet.zoomslider@<tt>40adeee</tt></a> which assigns the text to those links and causes this breakage.</p>

<p>What I'm unclear about is how zoomslider was generating it's default icons before that...</p>

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