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<!DOCTYPE html>
<script>
let goneBack = false;
let w;
onload = function() {
w = window.open("file_use_counter_bfcache_helper.html?a", "_blank");
};
onmessage = function() {
switch (event.data) {
case "a-doc-loaded":
if (!goneBack) {
w.postMessage("click-b-link", "*");
}
break;
case "b-doc-loaded":
if (!goneBack) {
goneBack = true;
w.postMessage("go-back", "*");
}
break;
case "a-doc-shown":
if (goneBack) {
w.postMessage("set-use-counter", "*");
}
break;
case "did-set-use-counter":
w.postMessage("click-c-link", "*");
break;
case "c-doc-loaded":
w.close();
// Signal that we've finished.
location.hash = "#finished";
break;
}
};
</script>