[12.x] explain how to use @once/@pushOnce with a custom ID #10867
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relying on the default random generated string only works if the code is compiled once, like in a loop or in a single component. if you wish to use the directives across multiple compilations, like in separate components, you **must** pass a custom unique ID for them to only be rendered once.
browner12 changed the title @once/@pushOnce with a custom ID@once/@pushOnce with a custom ID 
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relying on the default random generated string only works if the code is compiled once, like in a loop or in a single component.
if you wish to use the directives across multiple compilations, like in separate components, you must pass a custom unique ID for them to only be rendered once.