tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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beforeunload_test_page.html (2415B)

      1 <!doctype html>
      2 <html>
      3 <body>
      4 
      5 <p>
      6  There are currently <span id="totalInnerHandlers">0</span> beforeunload handlers registered in this frame.
      7 </p>
      8 <p>
      9  There are currently <span id="totalOuterHandlers">0</span> beforeunload handlers registered on my subframe.
     10 </p>
     11 
     12 <iframe src="about:blank" id="subframe"></iframe>
     13 
     14 <script>
     15  this.BeforeUnloader = {
     16    _innerEventHandlers: [],
     17    _outerEventHandlers: [],
     18 
     19    get $totalInner() {
     20      delete this.$totalInner;
     21      return this.$totalInner = document.getElementById("totalInnerHandlers");
     22    },
     23 
     24    get $totalOuter() {
     25      delete this.$totalOuter;
     26      return this.$totalOuter = document.getElementById("totalOuterHandlers");
     27    },
     28 
     29    get $subframe() {
     30      delete this.$subframe;
     31      return this.$subframe = document.getElementById("subframe");
     32    },
     33 
     34    pushInner(howMany) {
     35      for (let i = 0; i < howMany; ++i) {
     36        let func = () => {};
     37        this._innerEventHandlers.push(func);
     38        addEventListener("beforeunload", func);
     39      }
     40 
     41      this.$totalInner.textContent = this._innerEventHandlers.length;
     42    },
     43 
     44    popInner(howMany) {
     45      for (let i = 0; i < howMany; ++i) {
     46        let func = this._innerEventHandlers.pop();
     47        if (func) {
     48          removeEventListener("beforeunload", func);
     49        }
     50      }
     51 
     52      this.$totalInner.textContent = this._innerEventHandlers.length;
     53    },
     54 
     55    pushOuter(howMany) {
     56      if (!this.$subframe.parentNode) {
     57        throw new Error("Subframe I'm holding a reference to detached!");
     58      }
     59 
     60      for (let i = 0; i < howMany; ++i) {
     61        let func = () => {};
     62        this._outerEventHandlers.push(func);
     63        this.$subframe.contentWindow.addEventListener("beforeunload", func);
     64      }
     65 
     66      this.$totalOuter.textContent = this._outerEventHandlers.length;
     67    },
     68 
     69    popOuter(howMany) {
     70      if (!this.$subframe.parentNode) {
     71        throw new Error("Subframe I'm holding a reference to detached!");
     72      }
     73 
     74      for (let i = 0; i < howMany; ++i) {
     75        let func = this._outerEventHandlers.pop();
     76        if (func) {
     77          this.$subframe.contentWindow.removeEventListener("beforeunload", func);
     78        }
     79      }
     80 
     81      this.$totalOuter.textContent = this._outerEventHandlers.length;
     82    },
     83 
     84    reset() {
     85      this.popInner(this._innerEventHandlers.length);
     86      this.popOuter(this._outerEventHandlers.length);
     87    },
     88  };
     89 </script>
     90 
     91 </body>
     92 </html>