![]() It starts with one of two six byte long sequences identifying the version of the format that is being used. GIF has a header at the start of the file identifying it as such. > if the GIF was served as image/png then it wouldn't be until the image finished downloading that the browser would learn it was a GIF ![]() Browser developers think about these things all the time and have, in some cases, decades of experience dealing with them, yet they constantly get lambasted by armchair strategists who've thought about these issues for five minutes and decided it's all easy. Web browsers are part of a complex ecosystem where seemingly straightforward actions have all kinds of unintended consequences. You may not see that as a problem, but it pushes app developers to support only native platforms - where you can't block anything. "Obnoxious ads will negatively impact a site's reputation and people's willingness to view/use it."Īnother problem with adding rate limits or other ever-increasingly complicated heuristics is that it makes the Web platform ever more difficult to deploy applications on. You'd think so, but the same argument is used to claim that blocking isn't needed at all. ![]() At some point the worsening user experience will negatively impact a site's reputation and people's willingness to view/use it.
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