index.js

const { ConsoleSpanExporter, SimpleSpanProcessor } = require('@opentelemetry/sdk-trace-base');
const { WebTracerProvider } = require('@opentelemetry/sdk-trace-web');
const { ZipkinExporter } = require('@opentelemetry/exporter-zipkin');
const { Resource } = require('@opentelemetry/resources');
const { SEMRESATTRS_SERVICE_NAME } = require('@opentelemetry/semantic-conventions');

const provider = new WebTracerProvider({
  resource: new Resource({
    [SEMRESATTRS_SERVICE_NAME]: 'zipkin-web-service'
  })
});

provider.addSpanProcessor(new SimpleSpanProcessor(new ConsoleSpanExporter()));
provider.addSpanProcessor(new SimpleSpanProcessor(new ZipkinExporter({
  // testing interceptor
  // getExportRequestHeaders: ()=> {
  //   return {
  //     foo: 'bar',
  //   }
  // }
})));

provider.register();

const tracer = provider.getTracer('example-tracer-web');

const prepareClickEvent = () => {
  const element = document.getElementById('button1');

  const onClick = () => {
    const span = tracer.startSpan('foo');
    span.end();
  };
  element.addEventListener('click', onClick);
};

window.addEventListener('load', prepareClickEvent);