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<title>dev::Parity.js</title>
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<div class="box">
best block #<span id="blockNumber">unknown</span>
</div>
<script>
window.parity.api.subscribe('eth_blockNumber', function (error, blockNumber) {
if (error) {
console.log('error', error);
return;
}
document.getElementById('blockNumber').innerHTML = blockNumber.toFormat(0);
});
</script>
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