Sample using href="bitcoin:..." 
<a
  href="bitcoin:1BPVHqxcMAdPEtfSHLLPfpqucrDfgCGgD4?amount=0.01"
>
  Sample using href="bitcoin:..."
</a>
Sample using href="bitcoin:..." with an amount 
<a
  href="bitcoin:1BPVHqxcMAdPEtfSHLLPfpqucrDfgCGgD4?amount=0.01"
>
  Sample using href="bitcoin:..." with an amount
</a>
Sample using data-btcaddress 
<a
  href="https://blockchain.info/address/1BPVHqxcMAdPEtfSHLLPfpqucrDfgCGgD4"
  data-btcaddress="1BPVHqxcMAdPEtfSHLLPfpqucrDfgCGgD4"
>
  Sample using data-btcaddress
</a>
Sample using data-btcaddress with an amount 
<a
  href="https://blockchain.info/address/1BPVHqxcMAdPEtfSHLLPfpqucrDfgCGgD4"
  data-btcaddress="1BPVHqxcMAdPEtfSHLLPfpqucrDfgCGgD4"
>
  Sample using data-btcaddress with an amount
</a>

You can view the source for an explanation of how this all works.