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The SfMultiSelect component renders as <input type="text">. Unfortunately, most browsers try to auto-fill this whenever it appears to be part of an address. For example, if I have a MultiSelect that allows the user to select multiple states in the US, the browser will show its own auto-fill state drop-down on top of the multi-select drop-down. It's annoying and confusing to users.
The rendered <input> tag already includes the attribute autocomplete="off", but that doesn't work because it's ignored by newer versions of Chrome and other browsers.
The solution is to render it as <input type="search">. It will work the same, but browsers won't try to auto-fill it.