.on('click', function() {
   post(window, editorURL, {
     mode: 'vega-lite',
     spec: compactStringify(spec),
     config: vgSpec.config,
     renderer: 'svg'
   });
   event.preventDefault();
 });

 .on('click', () => {
   post(window, editorUrl, {
     config: config || null,
     mode,
     renderer,
     spec: stringify(spec),
   });
   d3.event.preventDefault();
 });

 .on('mousedown', function(this: HTMLLinkElement) {
   view
     .toImageURL(ext)
     .then(url => {
       this.href = url;
     })
     .catch(error => {
       throw error;
     });
   d3.event.preventDefault();
 });

 .on('click', () => {
   viewSource(stringify(spec), opt.sourceHeader || '', opt.sourceFooter || '');
   d3.event.preventDefault();
 });