1 files changed, 52 insertions, 0 deletions
diff --git a/browser/components/resistfingerprinting/test/browser/file_reduceTimePrecision_iframee.html b/browser/components/resistfingerprinting/test/browser/file_reduceTimePrecision_iframee.html
new file mode 100644
index 0000000000..d336fa8d85
--- /dev/null
+++ b/browser/components/resistfingerprinting/test/browser/file_reduceTimePrecision_iframee.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<meta charset="utf8">
+<script>
+window.onload = async () => {
+  parent.postMessage("ready", "*");
+}
+
+window.addEventListener("message", async function listener(event) {
+  if (event.data[0] == "gimme") {
+    var result = [];
+
+    // Prepare for test of AudioContext.currentTime
+    // eslint-disable-next-line
+    let audioContext = new AudioContext();
+
+    // Known ways to generate time stamps, in milliseconds
+    const timeStampCodes = [
+      "performance.now()",
+      "new Date().getTime()",
+      "new Event(\"\").timeStamp",
+      "new File([], \"\").lastModified",
+    ];
+    // These are measured in seconds, so we need to scale them up
+    var timeStampCodesDOM = timeStampCodes.concat([
+      "audioContext.currentTime * 1000",
+    ]);
+
+    for (let timeStampCode of timeStampCodesDOM) {
+      // eslint-disable-next-line no-eval
+      let timeStamp = eval(timeStampCode);
+
+      result.push({
+        'name': timeStampCode,
+        'value': timeStamp
+      });
+    }
+
+    let worker = new SharedWorker("file_reduceTimePrecision_iframe_worker.sjs");
+    let worker_result = await new Promise(resolve => {
+      worker.port.onmessage = function(e) {
+        resolve(e.data);
+      };
+    });
+
+    for (let item of worker_result) {
+      result.push(item);
+    }
+
+    parent.postMessage(result, "*")
+  }
+});
+</script>