Create new GD image resource with transparency support

Adds loading attribute to an img HTML tag.

Adds srcset and sizes attributes to an existing img HTML tag.

Adds width and height attributes to an img HTML tag.

Increases an internal content media count variable.

Determines whether to add the loading attribute to the specified tag in the specified context.

Determines the maximum upload size allowed in php.ini.

Maybe attempts to generate attachment metadata, if missing.

Finds and exports attachments associated with an email address.

Provides a No-JS Flash fallback as a last resort for audio / video.