It's the fact that a playing movie usually expects to be on top, combined with the fact that the dropdown does not render until it activates.
We need some limits on what ads can do:
- They must not use up all of the CPU time.*
- They must not do anything when the mouse rolls over them.*
- They must not scroll the screen to show the ad.
- They must not hide the insertion point.
- They must not freeze the mouse.
- They must not expand to cover other parts of the page.
- They must not make sounds.
- They must not prevent navigation.
- They must not advertise anything a child should not see.
And here is a lost of things I would prefer that ads not do:
- No animation. It's extremely distracting.
- No blinking text.
- Any link should be a visible link, not the entire ad.
- Following the link must not destroy the browser history.*
* This should be true for all websites, not just ads.
Nope, that's not it. It's a problem with some Flash-based ads setting their wmode to window as opposed to opaque and transparent. Flash movies in the window mode do not render as part of the page's DOM but instead actually sit in a separate "window" on top of the entire web browser, after the page has completely rendered. Therefore, it's impossible for anything to draw on top of it. (The benefit to this mode is that Flash rendering bypasses being drawn by the web browser and so it's much faster. However, it's obviously not designed for advertising and other Flash elements that are supposed to be integrated within web designs.) Unfortunately, the wmode for an individual ad cannot be set on our end nor do we have the ear of the people who can change it.
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