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If you use either source maps or sourceURL (both covered in this primer on source maps), then you may see a warning in Chrome console like "/*@ sourceMappingURL=" source mapping URL declaration is deprecated, "/*# sourceMappingURL=" declaration should be used instead.
Here's what that's about:
Impetus//@ sourceMappingURL was found to have a conflict with IE whenever it was found in the page after //@cc_on was interpreted to turn on conditional compilation in the IE JScript engine. A legacy version of the HTML5 Shiv is one particular offender here.
The //@ sourceMappingURL syntax is defined in the Sourcemap V3 spec It was changed there to use //# syntax instead.
//@ sourceURL is also defined in the spec and was made to match the //# syntax for consistency. Follow through, for details on what sourceURL does. It's used by Ember's minispade, Google's concatenate.js, and others. In Chrome, sourceURL is supported for inline scripts and inline styles, in addition to evaluated JS.
//# for sourceMappingURL and sourceURL//@ syntax.While these changes make their way to stable release, you can use both syntaxes simultaneously for full tool support or migrate immediately to the # syntax, depending on your needs.
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2013-06-12 UTC.
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