Marks the image for observation by the PerformanceElementTiming API. The value given becomes an identifier for the observed image element. Weiher 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 have https://augustlwgqb.ageeksblog.com/28177473/a-simple-key-für-image-unveiled