Multiple import mapsLimited availability
Multiple <script type="importmap"> HTML elements merge to produce the overall import map.
Not yet supported in all major browsers — check the table and provide a fallback.
Browser support
DesktopChrome
1–132Not supported
133+Supportedsince Feb 4, 2025
Current: 155Edge
12–132Not supported
133+Supportedsince Feb 6, 2025
Current: 154Firefox
✕Not supportedup to 157
Current: 157Safari
1–18.3Not supported
18.4+Supportedsince Mar 31, 2025
Current: 27MobileChrome Android
18–132Not supported
133+Supportedsince Feb 4, 2025
Current: 155Firefox Android
✕Not supportedup to 157
Current: 157Safari iOS
1–18.3Not supported
18.4+Supportedsince Mar 31, 2025
Current: 27How to use
Not supported in Firefox, Firefox Android. Use feature detection below and provide a fallback (or a polyfill) for those browsers.
Example
Full syntax and examples are on MDN — see the links below.
Feature detection
JS · check before using
if ("type" in document.createElement("script")) {
// the type attribute/property of <script> is supported
}