| <!DOCTYPE html> | 
 | <title>Incumbent page used as a test helper</title> | 
 |  | 
 | <iframe src="//{{domains[www1]}}:{{location[port]}}/FileAPI/support/document-domain-setter.sub.html" id="c"></iframe> | 
 | <iframe src="//{{domains[www2]}}:{{location[port]}}/FileAPI/support/document-domain-setter.sub.html" id="r"></iframe> | 
 | <iframe src="//{{domains[élève]}}:{{location[port]}}/FileAPI/support/document-domain-setter.sub.html" id="bs"></iframe> | 
 |  | 
 | <script> | 
 | "use strict"; | 
 | document.domain = "{{host}}"; | 
 |  | 
 | window.createBlobURL = () => { | 
 |     const current = document.querySelector("#c").contentWindow; | 
 |     const relevant = document.querySelector("#r").contentWindow; | 
 |     const blobSource = document.querySelector("#bs").contentWindow; | 
 |  | 
 |     const blob = new blobSource.Blob(["Test Blob"]); | 
 |  | 
 |     return current.URL.createObjectURL.call(relevant, blob); | 
 | }; | 
 |  | 
 | </script> |