MDN shows Firefox doesn't support multiple import maps. And Safari supports import maps.
So you can use them on most browsers with the caveat that it is a single import map.
The biggest problem I see with import maps, or any import functionality that allows third party websites, are toolchain attacks. With backend languages, like Go, It is safer because the app goes through a build process.
If a third party website is taken over by malicious people and a library is imported from it, there will be a certain amount of time your site could host malware until it the import is changed.
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MDN shows Firefox doesn't support multiple import maps. And Safari supports import maps.
So you can use them on most browsers with the caveat that it is a single import map.
The biggest problem I see with import maps, or any import functionality that allows third party websites, are toolchain attacks. With backend languages, like Go, It is safer because the app goes through a build process.
If a third party website is taken over by malicious people and a library is imported from it, there will be a certain amount of time your site could host malware until it the import is changed.