No way to view the source of the viz using the frontend
In viz editor, erasing all text goes back to the "Add Viz Script" button, making it tricky to erase then paste source from another file
Would be nice to be able to render viz without saving, in order to develop using the frontend editor (like codepen)
From dataset's landing page, clicking Edit, then adding viz, then clicking Save gives an error because the Dataset Name is blank (should be filled in with the current name instead)
Suggestion: Dataset Name has an uneditable "me/" prefix before the input field