css3 - CSS: last-child selector won't work? -

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  & lt; div वर्ग = "टिप्पणी लिस्ट" & gt; & Lt; लेख वर्ग = "टिप्पणी" आईडी = "कॉम 21" & gt; & lt; / आलेख & gt; & Lt; आलेख वर्ग = "टिप्पणी" id = "com20" & gt; & lt; / आलेख & gt; & Lt; लेख वर्ग = "टिप्पणी" id = "com19" & gt; & lt; / आलेख & gt; & Lt; / div & gt;   
 कोई भी विचार क्यों निम्नलिखित अंतिम-बाल चयनकर्ता मेरे लिए काम नहीं करेगा?  
  .comment {width: 470px; सीमा नीचे: 1px बिंदीदार # f0f0f0; margin-bottom: 10px; } .comment: अंतिम-बच्चे {सीमा नीचे: कोई नहीं; margin-bottom: 0; }   
 तो इस मामले में  # com19  को बॉर्डर नहीं होना चाहिए और तल पर मार्जिन होना चाहिए। मैं यहाँ क्या गलत कर रहा हूं?  
 धन्यवाद   
 
 
 ऐसा लगता है कि सब कुछ है सही - मैंने बनाया है  
 समस्या कहीं और है - "सीमा" का मूल्य क्या है? (क्या यह PHP चर है?) यह सुनिश्चित करने के लिए कि आपके कथन का उपयोग किया जाएगा, आप जोड़ सकते हैं! महत्वपूर्ण

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