NetworkInformation: downlinkMax property
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
Note: This feature is available in Web Workers.
The downlinkMax read-only property of the NetworkInformation interface returns the maximum downlink speed, in megabits per second (Mbps), for the underlying connection technology.
Value
A number representing the maximum downlink speed, in megabits per second (Mb/s), for the underlying connection technology.
Examples
The following example monitors the connection using the change event and logs changes as they occur.
js
function logConnectionType() {
let connectionType = "not supported";
let downlinkMax = "not supported";
if ("connection" in navigator) {
connectionType = navigator.connection.effectiveType;
if ("downlinkMax" in navigator.connection) {
downlinkMax = navigator.connection.downlinkMax;
}
}
console.log(
`Current connection type: ${connectionType} (downlink max: ${downlinkMax})`,
);
}
logConnectionType();
navigator.connection.addEventListener("change", logConnectionType);
Specifications
| Specification |
|---|
| Network Information API # dom-networkinformation-downlinkmax |
Browser compatibility
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downlinkMax
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Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support
- No support
- No support
- Experimental. Expect behavior to change in the future.
- See implementation notes.