<!DOCTYPE html> <meta charset="utf-8"> <meta name="timeout" content="long"> <title>NDEFReader.onreading respect page visibility changes</title> <link rel="help" href="https://w3c.github.io/web-nfc/#visible-document"> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <script src="resources/nfc-helpers.js"></script> <script> nfc_test(async (t, mockNFC) => { const ndef = new NDEFReader(); const ndefWatcher = new EventWatcher(t, reader, ["reading", "readingerror"]); const promise = new Promise((resolve, reject) => { ndefWatcher.wait_for("reading").then(event => { if (document.hidden) reject(); else resolve(); }); }); await ndef.scan(); await promise; }, "Test NDEFReader.onreading is not fired when document is hidden"); </script> <p>Step1: switch the page to the background, then tap a formatted NFC tag.</p> <p>Step2: switch back to the page, then tap the tag again.</p>