Add HTML5 boolean attributes to the list #30
Merged
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I noticed that when rendering a video element,
tal:attributes="autoplay python:''"
was rendering as autoplay='' which is treated as a positive value in the browser, enabling autoplay. By extending the list of boolean HTML attributes, the attribute is now dropped when empty.I've included all the boolean attributes, and kept the old attributes, to maintain backwards compatibility.
Here's a list of all HTML5 boolean attributes, derived from https://html.spec.whatwg.org/multipage/indices.html#attributes-3
allowfullscreen
async
autofocus
autoplay
checked
controls
default
defer
disabled
formnovalidate
inert
ismap
itemscope
loop
multiple
muted
nomodule
novalidate
open
playsinline
readonly
required
reversed
selected
shadowrootclonable
shadowrootdelegatesfocus
shadowrootserializable