Internet Explorer Rollovers Test | 4
Internet Explorer Image Rollover Test
To recreate the error, first clear your cache, and then set your Internet Explorer Cache settings to
check for new versions of pages "Every visit to the page." After you have done
this, refresh this page, then begin rolling up and down over the images at the
In our own testing we can typically trigger the error within a minute or two;
sometimes almost immediately, sometimes it takes a couple minutes. You'll know the
error is triggered when:
- The IE "globe" (or whatever logo you have in the top right corner) continues
to "spin" even after you stop rolling, as if it is waiting for the next image
to download. That image, however, never comes; causing the logo to continue
spinning until timeout. On our machines, this timeout occurs after 5 minutes of waiting (note: this "5 minutes" will reset if you click other local links during the 5 minute time period). After the timeout occurs, then the page begins to function normally.
- During the "timeout" period described above, trying to click through to any other page within the same domain, or even reloading this page, will not
work, though the globe typically will stop spinning when you first attempt to click away from
the page. If the page you are trying to click through to was previously loaded in your cache, however, then it will usually come up ok.
- Backing up to the previous page, and then coming forward to this page will
usually reset everything to ok. Sometimes we've found it necessary to back up
two pages. Also, clicking through to a page in a different domain will work, too. For example, when you see the problem occur, try clicking the first three links in the "Test Links" section below. Those will not work, since they all point to WebReference (where you are now). The remaining two links, however, to Jupitermedia and Microsoft, will work.
- If you're monitoring memory usage in IE while you roll (using perfmon, for
example) then you will see a sharp memory spike just as the error occurs. We
don't know, however, whether the problem causes the spike or vice versa.
Test Page 1 (in this directory)
Test Page 4 (in this directory)
We've also tried the same test with pages where the images are preloaded
and where we retrieve the images to
swap using the document.images array, as opposed to
results were the same for us in both cases.
Microsoft has confirmed the demonstrated behavior as a bug. See
these KB entries for further information:
BUG: Internet Explorer Stops Responding When You Download Images
Internet Explorer Hangs for Five Minutes Accessing Dynamic Content in Frames
MS Knowledge Base
issue describing Cache registry key
A couple interesting links on MS connection limits.
Note that the registry key described in the second entry does
appear to alleviate the problem (at least it did in our testing)
but that changing it is generally not recommended.