Re: [img-conversion] Convert to spec (#14)

>        </h2>
> +      <pre class="idl">
> +typedef (HTMLImageElement or Blob) ImageSource;
> +
> +partial interface ImageData {
> +  [NewObject] Promise&lt;Blob&gt; toBlob (optional DOMString type, optional EncoderOpts options);
> +  [NewObject] static Promise&lt;ImageData&gt; create (ImageSource source);
> +  static CanPlayTypeResult canDecodeType (DOMString mimeType);
> +  static CanPlayTypeResult canEncodeType (DOMString mimeType);

Is there a use-case for this decode/encode separation? Are there formats that browsers can decode but not encode?

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