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.

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.
RobOwner (Aidellio)Commented:
JavaScript can inject content and manipulate what is seen on the client however it will not update your master page.  
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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.


Any ideas or other suggestions would be great.

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