[wp-trac] [WordPress Trac] #43263: wp_audio_shortcode() preload default: should it be metadata or none?

[WordPress Trac]

#43263: wp_audio_shortcode() preload default: should it be metadata or none?
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 Reporter:  hearvox      |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Media        |    Version:  3.6
 Severity:  normal       |   Keywords:
  Focuses:               |
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 Using this ticket to open a discussion about the `audio` tag’s `preload`
 attribute defaulting to
 `none` in `wp_audio_shortcode()`.

 `none` won’t display the audio’s total time in the player (until the user
 hits play). So the effect of this default is millions of sites’ players
 display total times of “00:00”. (You can specify preload as a shortcode
 attr, but most sites don’t. )

 Setting the `preload` attribute to `metadata` does extract and display
 total time upon page-load. Also `metadata` is both the
 `wp_video_shortcode()` default and the HTML-spec suggested default (to
 browser makers):
 https://developer.mozilla.org/en-US/docs/Web/HTML/Element/audio#attr-
 preload

 Bandwidth might be the valid concern, tho, as some browsers preload an
 excessive amount of metadata (I'm looking at you, Chrome) . See results of
 tests by @blobfolio:
 https://wordpress.slack.com/archives/C02SX62S6/p1518116191000138

 FYI, the default `'preload' => 'none'` is here:
 https://core.trac.wordpress.org/browser/tags/4.9/src/wp-
 includes/media.php#L2223

 FYI-2, you can change that with the `wp_audio_shortcode` filter (via regex
 on the HTML output):
 https://gist.github.com/hearvox/098774e9887442d39ddc6e34bedb10b1

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Ticket URL: <https://core.trac.wordpress.org/ticket/43263>
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