srcdoc polyfill 

HTML5 defines a new attribute for iFrames named srcdoc. This attribute allows
developers to specify an iFrame's content in-line with the iFrame itself. For
instance:

This feature only began to see adoption in major browsers in early 2013.
Fortunately, most older browsers support similar functionality through
script-targeted URLs, i.e.

(Because of limitations on URL length, the actual mechanism that the polyfill
implements not quite this direct.)

For more on srcdoc, see the WhatWG specification and this post on
Bocoup.com.

Usage

By including the script at the bottom of the document , any available
iFrames which declare a srcdoc attribute attribute) will receive this
"shimmed" behavior. (In browsers that already implement this functionality, no
change will take place.)

**Note on the HTML5 sandbox
attribute:**
Because the shim operates using a script-targeted URL in legacy environments,
some configurations of the sandbox attribute may interfere with its behavior.
This issue will only surface in environments that implement sandbox but that
do not implement srcdoc. Because of this, this polyfill's default behavior
is to issue a warning for potentially-hazardous configurations but to proceed
optimistically. The API supports an force option that enables modification of
this behavior.

Executing

This script may be consumed as a AMD module, a CommonJS module, or standalone
via direct inclusion with a