From PC World: Have you ever tried to click “back” on a website, but instead of returning to the previous page you ended up on a wall of ads? This can happen when websites or advertising networks use JavaScript to alter your browser’s history. It’s especially common in mobile browsers.
In a recent Google Search Central blog post, the company says that this type of “back button hijacking” is growing increasingly prevalent and wants to do something about it. Back button hijacking is now a codified violation in its spam policy, which comes into effect on June 15th.
Websites now have two months to remove all scripts that manipulate users’ browser histories and must also ensure that any libraries or ad platforms they use don’t hijack the back button. Sites that violate this new policy may, among other things, be penalized with a lower ranking in Google’s search results.
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