Marks the image for observation by the PerformanceElementTiming API. The value given becomes an identifier for the observed image Chemisches 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: Use both width https://elliottqbmwg.rimmablog.com/28368985/the-ultimate-guide-to-image