navigator.vendorSub is a read-only property that always returns the empty string ("") in any browser (MDN). It remains for legacy / compatibility — not for useful vendor details.
Read the notes below before you rely on this property. Prefer feature detection when support is limited.
Use navigator.vendorSub. Start with this line.
navigator.vendorSub| Call | What it does |
|---|---|
navigator.vendorSub | Primary signature. |
Built into the browser. Read navigator.vendorSub on Navigator — no import required.
navigator.vendorSubThis member has no parameters beyond those shown in the signature.
| Return Value | Description |
|---|---|
| * | "" (empty string) |
vendorSubConfirm the value is the empty string (MDN).
console.log(navigator.vendorSub);
console.log(JSON.stringify(navigator.vendorSub)); // ""
console.log(navigator.vendorSub.length); // 0"" in any browser.JSON.stringify. Makes empty strings visible in console output.length. Should be 0.vendor and productSubSee which related legacy fields actually carry values.
console.log("vendor:", JSON.stringify(navigator.vendor));
console.log("vendorSub:", JSON.stringify(navigator.vendorSub));
console.log("productSub:", JSON.stringify(navigator.productSub));vendor may vary. Chromium / Safari / Firefox differ (MDN).vendorSub stays empty. No browser-specific content.productSub often has tokens. Still not a good feature gate.Ignore vendorSub for decisions — ask for the capability you need.
// Avoid: if (navigator.vendorSub) { … } // always falsy
if ("serviceWorker" in navigator) {
console.log("Service workers supported");
} else {
console.log("Service workers not supported");
}
console.log("vendorSub length:", navigator.vendorSub.length); // 0vendorSub is always falsy as a condition.Navigator.vendorSub returns a string that is always empty. MDN marks it Baseline Widely available (since July 2015). Not Deprecated, Experimental, or Non-standard.
Present in all modern browsers. The return value is "" everywhere — a compatibility stub, not a useful identifier.
Bottom line: Safe to read; never useful for sniffing. See the MDN vendorSub reference.
Learn how navigator.virtualKeyboard accesses the VirtualKeyboard API.
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