shr-prefer-media-type-alist

shr-prefer-media-type-alist is a variable defined in `shr.el'.
Its value is

(("webm" . 1.0)
 ("ogv" . 1.0)
 ("ogg" . 1.0)
 ("opus" . 1.0)
 ("flac" . 0.9)
 ("wav" . 0.5))

Documentation:
Preferences for media types.
The key element should be a regexp matched against the type of the source or
url if no type is specified. The value should be a float in the range 0.0 to
1.0. Media elements with higher value are preferred.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.4 of Emacs.