Expand description
Conservative HTML minification, modelled on html-minifier-terser with
collapseWhitespace, removeComments and useShortDoctype.
With shorten_attributes, boolean attributes lose their values
(defer="defer" to defer), and whitespace that doesn’t matter comes out of
class, srcset, sizes, URL attributes and the viewport <meta>.
Attribute order and quoting are left alone; <pre>, <textarea>,
<script> and <style> contents are copied verbatim.