It’s been said for years that the page view is dead as a way to measure media on the web. Now, finally, there may be a replacement. Advertisers and publishers are increasingly asking if “time” or “attention” — proven time spent engaging with media — can work instead. They’re hoping that by using technology to show that someone spent a specified amount of time engaging with a page while an ad was in view, they’ll solve quandaries posed by current metrics.