JSOM SharePoint injection

Hi All,

When injecting JavaScript or CSS into a master page, does it actually modify the master page?  I'm trying to figure out the concept behind injecting code.

Thanks
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IsaacSharePoint Client Side DeveloperAsked:
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Jamie McAllister MVPSharePoint ConsultantCommented:
I think you're talking about modifying the behavior of the DOM at runtime through script? As such, the masterpage is not actually changed.
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RobOwner (Aidellio)Commented:
JavaScript can inject content and manipulate what is seen on the client however it will not update your master page.  
where does your question stem from?
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IsaacSharePoint Client Side DeveloperAuthor Commented:
I read that you shouldn't tamper with the masterpage of a sharepoint site and that injecting javascript and css into the page is what's recommended.

I found the following and wasn't sure how it worked.

https://github.com/OfficeDev/PnP/tree/master/Samples/Core.EmbedJavaScriptJSOM

Any ideas or other suggestions would be great.

Thanks!
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