Change the hiding strategy of the test_iframe.

This commit contains three changes:

  * First, the test_iframe is taken out of span with `display: none`,
    so that it is initially visible
  * That iframe is hidden via absolute positioning now and negative
    `top` and `left` values
  * Also inttroduced is a configurable delay for when the test_iframe
    actally considers a test page being done loading and signaling the
    test-suite that it can continue with running the tests.

tests/Test.AnotherWay.css

@@ -240,4 +240,12 @@ body {
 
 #record_input {
     width: 53%;
+}
+#taw-test-iframe {
+    padding: 0;
+    width: 200px;
+    height: 200px;
+    position: absolute;
+    top: -1000px;
+    left: -1000px;
 }

tests/Test.AnotherWay.js

@@ -37,6 +37,7 @@ Test.AnotherWay._g_pages_to_run = null; // list of pages to run automatically af
 Test.AnotherWay._g_run_on_main_load = false; // special handling for run_pages_to_run when it might be called before onload or before list of test pages is known.
 Test.AnotherWay._g_run_on_list_load = false;
 Test.AnotherWay._g_main_loaded = false;
+Test.AnotherWay._test_page_onload_delay_ms = 2000; // Number of milliseconds to wait after the iframe fired the onload event
 
 Test.AnotherWay._run_pages_to_run = function(called_from_outside){
     if (!Test.AnotherWay._g_main_loaded) {

tests/run-tests.html

@@ -92,11 +92,10 @@
                 </div>
             </div>
         </div>
+        <iframe id="taw-test-iframe" name="test_iframe" onload="window.setTimeout(Test.AnotherWay._test_page_onload,Test.AnotherWay._test_page_onload_delay_ms);"></iframe>
         <span style="display:none">
             <iframe name="list_iframe" onload="Test.AnotherWay._list_iframe_onload();">
             </iframe>
-            <iframe name="test_iframe" onload="Test.AnotherWay._test_page_onload();">
-            </iframe>
             <!-- record_control div is to be imported into other documents, so all its styles are inline -->-
             <div id="record_control" style="position:absolute;bottom:0;left:0;margin:0;padding:0.5em;width:22em;height:22em;border:1px solid;background:#ffd;font: normal normal 8pt sans-serif; color:#000; text-align: left">
                 <p style="margin:0 0 0 0; padding:0">