Marks the image for observation by the PerformanceElementTiming API. The value given becomes an identifier for the observed image element. Tümpel also the elementtiming attribute page. Try it Yourself » If a browser cannot find an image, it will display the value of the alt attribute: By contrast, when you https://trevorcoyjt.theblogfairy.com/28368581/detaillierte-hinweise-zur-image