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:
<iframe srcdoc="<html><body>Hello, <b>world</b>.</body></html>"></iframe>
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.
<iframe src="javascript: '<html><body>Hello, <b>world</b>.</body></html>'"></iframe>
(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 <body>, 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 <script> element.
API
The shim also defines a minimal JavaScript API:
srcDoc.set( iframe [, content [, options ] ] )- sets the content of the provided iFrame element using thesrcdocattribute where available (falling back on a script-targeted URL in non-supporting browsers).content(optional) - The desired content of the iFrame. If blank, the current value of the element'ssrcdocattribute will be referenced for content.options(optional) - An object used to specify low-level behavior. Supports a single attribute,force, for controlling behavior in the presence of thesandboxattribute (see the note in "Usage" section of this document).- If unspecified, a warning will be issued and the library will attempt to
shim the
srcdocbehavior optimistically. - If
true, then the target iFrame'ssandboxattribute will be removed prior to setting the content. Note that this - If
false, no warning will be issued and the library will attempt to shim thesrcdocbehavior optimistically.
- If unspecified, a warning will be issued and the library will attempt to
shim the
srcDoc.noConflict()- Sets the value of the globalsrcDocvariable to its original value. Returns thesrcDocobject defined by this project for re-aliasing.
Browser Support
Tested in the following browsers:
- Microsoft Internet Explorer
- 6, 7, 8, 9, 10, 11
- Microsoft Edge
- 13, 14
- Apple Safari
- 4, 5.0, 5.1, 6, 6.2, 7.1, 8, 9.1, 10
- Google Chrome
- 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24.0.1312.5 (beta), 25.0.1364.5 (dev), 55
- Opera
- 11.1, 11.5, 11.6, 12.10, 12.11 (beta), 42
- Mozilla FireFox
- 3.0, 3.6, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 (beta), 50
The following browsers are not supported:
- Opera 10.0
Building
The build process for this project is written with Grunt.js. Please refer to the grunt documentation for details on installing grunt.
Tests
The shim's tests are written in QUnit, and can be run by visiting the
test/index.html file in the browser, or by running grunt test from the
command line.
Release Notes
1.0.0(2017-01-29)- Warn in the presence of the
sandboxattribute if its value may cause issues in environments that support it
- Warn in the presence of the
0.2.0(2015-10-02)- Wrap in "UMD" pattern, enabling more natural consumption from CommonJS and AMD environments
0.1.1(2013-03-01)- Allow content length to exceed the limit browsers impose on URLs
0.1.0(2012-06-13)- Initial release
License
Copyright (c) 2012 Mike Pennisi
Licensed under the MIT license.