font-feature-values styleset test for Arial and Verdana

dabblet.css

/* font-feature-values styleset test for Arial and Verdana */
@font-feature-values Arial { @styleset {slabbed-I: 1; } }
@font-feature-values Verdana { @styleset { slabless-I: 1; } }

dabblet.html

<figure style="font-variant-alternates: styleset(slabbed-I);"><figcaption>"Slabbed" <samp>I</samp> in Arial:</figcaption>
 <mark><samp style="font-family: Arial;">I</samp></mark> 
       <samp style="font-family: Verdana;">I</samp>
</figure>
<figure style="font-variant-alternates: styleset(slabless-I);"><figcaption>"Slab-less" <samp>I</samp> in Verdana:</figcaption>
       <samp style="font-family: Arial;">I</samp> 
 <mark><samp style="font-family: Verdana;">I</samp></mark>
</figure>
<figure><figcaption>Default:</figcaption>
 <samp style="font-family: Arial;">I</samp>
 <samp style="font-family: Verdana;">I</samp>
</figure>

dabblet.js

// alert('Hello world!');

settings.json

{"view":"split","fontsize":"100","seethrough":"","prefixfree":"1","page":"all"}