javascript - How can I apply scrollbars to each individual part of a Canvas split into parts? -

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i have website set 1 javascript file calls 3 others , sets them parts of canvas. there way set scroll bars scroll through each part individually? have been looking @ html can't figure out how apply 1 part because main function sets parts, , because type of game , needs draw things , update them, can't separate code.

set heights containers , apply css

.container {     overflow-y: scroll;     height: 300px; }

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