Cronômetro em JavaScript

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STOPWATCH
VANILLA JAVASCRIPT S
00:00
Start Stop 
<div class wrapper >
<h1>Stopwatch</h1>
<h2>Vanilla JavaScript Stopwatch</h2>
<p><span id="seconds">00</span>:<span id="tens">00</span></p>
<button id="button-start">Start</button>
<button id="button-stop">Stop</button>
<button id="button-reset">Reset</button>
</div> 
HTML CSS JS Result
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