Basic bar chart

<!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>
  <svg height="100%" width="100%">
  </svg>
  <script>
    const rectWidth = 10
    const height = 274
    
    const domainData = [100, 200, 175, 200, 120]
    const domainExtent = d3.max(domainData)
    
    const colors = d3.scaleQuantize()
      .domain([100, domainExtent])
    	.range([
        '#f3f3f3', 
        '#efefef',
        '#ddd',
        '#939393',
        '#7a7a7a',
        '#000',
      ])
    
    const yCoordScale = d3.scaleLinear()
    	.domain([0, domainExtent])
    	.range([0, height])
    
    const reverseYCoordScale = d3.scaleLinear()
    	.domain([0, domainExtent])
      .range([height, 0])
		
    const svg = d3.selectAll('svg')
    	.style('padding', '30px')
    
    const leftAxis = d3.axisLeft()
      .scale(reverseYCoordScale)
			.ticks(3)
    
    svg
      .append('g')
    		.attr('transform', 'translate(30, 0)')
      .call(leftAxis)
		
    const rects = svg
    	.append('g')
    		.attr('transform', 'translate(40, 0)')
    	.selectAll('rect')
      .data(domainData)
      .enter()
        .append('rect')
        .attr('x', (d, i) => i * rectWidth)
        .attr('y', reverseYCoordScale)
        .attr('width', rectWidth)
        .attr('height', yCoordScale)
        .attr('fill', colors)
        .attr('stroke', 'white')
  </script>
</body>

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