| 
            31 March 1998:
           | 
          
             source code released 
           | 
        
        
          | 
            3 May 1998:
           | 
          
             "PNG owner" 
           | 
        
        
          | 
            Fall 1998:
           | 
          
             decision to switch to new layout engine 
           | 
        
        
          | 
            14 March 1999:
           | 
          
             Greg's first working, non-Classic build 
             [tinderbox] 
           | 
        
        
          | 
            1 April 1999:
           | 
          
             jwz departs 
             [nomo] 
           | 
        
        
          | 
            3 July 1999:
           | 
          
             first serious PNG hacks 
           | 
        
        
          | 
            23 July 1999:
           | 
          
             check-in privileges finally granted 
           | 
        
        
          | 
            27 July 1999:
           | 
          
             Necko lands; libc5 dies, glibc 2.0 dies 
           | 
        
        
          | 
            28 July 1999:
           | 
          
             PNG ownership resolved (libimg/png, libimg/pngcom) 
           | 
        
        
          | 
            8 August 1999:
           | 
          
             post-Necko libc5 build works ... only for root 
           | 
        
        
          | 
            21 August 1999:
           | 
          
             10 PNG patches submitted 
           | 
        
        
          | 
            11 September 1999:
           | 
          
             last successful (root-only, viewer-only) build 
           | 
        
        
          | 
            2 November 1999:
           | 
          
             last attempted build 
           | 
        
        
          | 
            18 January 2000:
           | 
          
             resignation as PNG owner 
           | 
        
        
          | 
            21 January 2000:
           | 
          
             first alpha release 
           | 
        
        
          | 
            31 March 2000:
           | 
          
             first beta release 
           |