JSFIDDLE “d3 is not defined” differences

Question

Why does this fiddle's results work http://jsfiddle.net/airwwwave/k74rs1fk/1/

and this one's doesn't https://jsfiddle.net/airwwwave/k74rs1fk/1/

A look at the latter's console says d3 is not defined?

Both examples have D3 3.0.4 onLoad.

Same behavior in both Chrome and FF.

Answer 1

The reason is logged in the console itself:

Mixed Content: The page at 'https://fiddle.jshell.net/airwwwave/k74rs1fk/1/show/' was loaded over HTTPS, but requested an insecure script 'http://d3js.org/d3.v3.min.js'. This request has been blocked; the content must be served over HTTPS.