Song Example crashes when playing song

[MagicPepsiCan]

Steps to replicate

1. Open p5.js Web Editor (https://alpha.editor.p5js.org)
2. Click Examples
3. Click Hello P5 : song
4. Click Play
5. In the generated sketch, click play song automatically

[yining1023]

I think this is related to #145: dom createA('#', 'link') function doesn't work as expected

[catarak]

Yes @yining1023, this is the same issue as #145. When you look at the src of the iframe after clicking on the button, it is https://alpha.editor.p5js.org/p5/sketches/SkHDjvqw_Xl/#, therefore clicking on the button has appended a # to the url and caused the iframe to reload. The solution to this is a combination of #166 and #212.

[catarak]

closing as this is the same issue as #145.