word clock prototype

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>

<body>
  <form><input id="hora_atual"></form>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)

svg.append("text")
      .text("uma")
    	.attr("id", "uma")
      .attr("y", 100)
      .attr("x", 120)
      .attr("font-size", 36)
      .attr("font-family", "monospace")

svg.append("text")
      .text("duas")
   		.attr("id", "duas")
      .attr("y", 100)
      .attr("x", 240)
      .attr("font-size", 36)
   		.style("display", true)
      .attr("font-family", "monospace")

d3.select("#hora_atual").on("input", function() {
          //console.log(+this.value);
  				update(+ this.value);
	 });
    
   function update(hora) {
     d3.selectAll("text").style("visibility", "hidden");
     if (hora == 1) {   			
	     console.log(hora==1);
       d3.select("#uma").style("visibility", "visible");
     } else if (hora == 2) {
       d3.select("#duas").style("visibility", "visible");
     }
   }
    
  </script>
</body>

https://d3js.org/d3.v4.min.js