Scale UIWebView contents to view width using javascript

gistfile1.m

[_webView stringByEvaluatingJavaScriptFromString:
      [NSString stringWithFormat:@"var result = '';"
       "var viewport = null;"
       "var content = null;"
       "var document_head = document.getElementsByTagName( 'head' )[0];"
       "var child = document_head.firstChild;"
       "while ( child )"
       "{"
       " if ( null == viewport && child.nodeType == 1 && child.nodeName == 'META' && child.getAttribute( 'name' ) == 'viewport' )"
       "   {"
       "     viewport = child;"
       "     viewport.setAttribute( 'content' , 'width=270;initial-scale=1.0' );"
       "     result = 'fixed meta tag';"
       " }"
       " child = child.nextSibling;"
       "}"
       "if (null == viewport)"
       "{"
       " var meta = document.createElement( 'meta' );"
       " meta.setAttribute( 'name' , 'viewport' );"
       " meta.setAttribute( 'content' , 'width=device-width;initial-scale=1.0' );"
       " document_head.appendChild( meta );"
       " result = 'added meta tag';"
       "}"
       ]
      ];