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+--- modern JavaScript features
+
+<p>
+pugl has no dependencies, and i'd like to keep it that way.
+</p>
+
+<p>
+i've been pretty liberal about using modern javascript;
+even though this could in theory run on IE it doesn't
+(in particular it's very nice to have template literals).
+that said, try to only use features that have at least as much
+support as webgl2 (i.e. &gt;94%).
+</p>
+
+<p>
+we use webgl2 because:
+<ul>
+ <li>having non-constant loops in shaders is nice</li>
+ <li>there aren't that many browsers that support webgl and ES6 but not webgl2 (looking at caniuse.com, they probably
+  make up around 2% of browser usage)</li>
+</ul>
+</p>