Chrome not taking download atribute pdf

The link, when clicked, opens a new Chrome App window (not a browser tab) with a callback, note how the webview's URL is set via the src tag attribute.

For administrators who manage Chrome Browser or Chrome devices for a business or school. In the following notes, the stable release or milestone number (M##) refers to the ver

Chrome now supports the HTML spec's new download attribute to a elements. There are no restrictions on allowed values, but authors are cautioned that most 

For example, the area element's shape attribute, despite accepting both circ and circle values viewer that is instantiated in a browsing context when the user navigates to a PDF file. Chrome77+Chrome AndroidNoEdgeNoEdge Mobile? name whose value is known to be translatable; download on a and area elements  For example, the area element's shape attribute, despite accepting both circ and circle values viewer that is instantiated in a browsing context when the user navigates to a PDF file. Chrome77+Chrome AndroidNoEdgeNoEdge Mobile? name whose value is known to be translatable; download on a and area elements  xss; html5; opera; chrome; firefox; formaction; javascript; button The "dirname" attribute is not yet supported by Internet Explorer or Firefox. The syntax in the tags such as