on-progress

Arguments: html-widget

Returns a function that will be called by the default html-widget-progress method while the html-widget is loading a web page or file, or else nil if no function has been supplied.

You can call (setf on-progress) to set the function to be called. The function should take three arguments, which are the same arguments that were passed to html-widget-progress.

See the html-widget control.

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Created 2015.5.21.