.... The head, or prologue, of the HTML document .... When the srcset attribute is set, the src files will be used as a “fallback” or “default” image. The idea is that there are other extension points for your use case (such as custom attributes in other namespaces (in XHTML), RDFa, Microdata, Meta tags, whatnot).. Together with SRCTec, our manufacturing subsidiary, we are redefining possible through innovation in science, technology and information — working for the best solution, not the bottom line. . There is not default value of HTML src attribute. If you are only going to provide a single source file format for the audio element, use the src attribute. If you wish to provide multiple source file formats, place two or more elements inside the