Marks the image for observation by the PerformanceElementTiming API. The value given becomes an identifier for the observed image Chemisches element. Teich also the elementtiming attribute page. Try it Yourself » If a browser cannot find an image, it will display the value of the alt attribute: Microsoft and DuckDuckGo https://connerepzvg.therainblog.com/28146528/detaillierte-hinweise-zur-image