Should we add a line in the readme files encouraging theme developers to add a sizes attribute?

[tevko]

I think it would only improve the performance of the site. Especially during a case where the browser thinks an image needs full resolution at 100vw, when it really only needs a fraction of that. @Wilto

[joemcgill]

I think we may want to revisit the idea of passing an $args parameter to the template tag, which could be used by developers for setting the sizes attribute along with the srcset attribute in their themes. I would imagine something like:

tevkori_get_src_sizes( $id, $size, $args );

Where $args accepts an array like so:

$args = array(
  'sizes' => array(
    [0] => array(
      'width' => '100vw',
      'media-query' => 'max-width: 30em',
    ),
    [1] => array(
      'width' => '50vw'
      'media-query' => 'max-width: 50em',
    ),
    [2] => array(
      'width' => 'calc(33vw - 100px)'
    ),
  )
)

That would at least give developers who want to declare a sizes attribute a way of doing so.

[jhned]

I agree with @joemcgill, that seems like a really easy way to add it in. I've got an idea for how to implement it (plus a couple of other items), so I'll go ahead and try it.

[tevko]

@jhned awesome, looking forward to your PR !