html dom w3c dom html HTMLImageElement htmlimageelementimpl htmlelementimpl htmlimageelement serialversionuid l getlowsrc setlowsrc lowsrc lowsrc getsrc setsrc src src name name getalign capitalize setalign align align getalt setalt alt alt border border getheight setheight height height gethspace sethspace hspace hspace getismap getbinary setismap getlongdesc setlongdesc longdesc longdesc getusemap setusemap getvspace setvspace vspace vspace getwidth setwidth width width htmlimageelementimpl htmldocumentimpl owner name owner name