Display missing ticks on y axis - d3.js

Question

I am rendering a horizontal bars graph as below.
I am unable to display, the bottom most tick of y-axis. how to display bottom most tick on y-axis ?
I have increased the height of the svg, height, because of which height is increasing, but tick still not visible.
var data = [
{ name: "0-18", value: 0.07507 },
{ name: "19-30", value: 0.01492 },
{ name: "31-50", value: 0.02782 },
{ name: "51-70", value: 0.04253 },
];
var margin = { left: 100, top: 10, right: 10, bottom: 100 };
var width = 600 - margin.left - margin.right;
var height = 400 - margin.top - margin.bottom;
var svg = d3
.select("body")
.append("svg")
.attr("width", width)
.attr("height", height);
var x = d3
.scaleLinear()
.domain([0, d3.max(data, (d) => d.value)])
.range([margin.left, width]);
var y = d3
.scaleBand()
.domain(d3.range(data.length))
.rangeRound([margin.top, height])
.padding(0.2);
svg
.append("g")
.attr("class", "y-axis")
.attr("transform", `translate(${margin.left}, 0)`)
.call(
d3
.axisLeft(y)
.tickFormat((i) => data[i].name)
.tickSizeOuter(10)
);
svg
.append("g")
.attr("fill", "steelblue")
.selectAll("rect")
.data(data)
.join("rect")
.attr("x", x(0))
.attr("y", (d, i) => y(i))
.attr("width", (d) => x(d.value) - x(0))
.attr("height", y.bandwidth());
svg
.append("g")
.attr("fill", "white")
.attr("text-anchor", "end")
.attr("font-family", "sans-serif")
.attr("font-size", 12)
.selectAll("text")
.data(data)
.join("text")
.attr("x", (d) => x(d.value) - 4)
.attr("y", (d, i) => y(i) + y.bandwidth() / 2)
.attr("dy", "0.35em")
.text((d) => d3.format(".0%")(d.value));
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.15.0/d3.min.js"></script>

Answer 1

Just amend rangeRound() second value for y to be like this:
.rangeRound([margin.top, height - margin.top ])
to understand more about margin convention check this article on observable for margin convention, here is a working snippet:
var data = [
{ name: "0-18", value: 0.07507 },
{ name: "19-30", value: 0.01492 },
{ name: "31-50", value: 0.02782 },
{ name: "51-70", value: 0.04253 },
];
var margin = { left: 100, top: 10, right: 10, bottom: 100 };
var width = 600 - margin.left - margin.right;
var height = 400 - margin.top - margin.bottom;
var svg = d3
.select("body")
.append("svg")
.attr("width", width)
.attr("height", height);
var x = d3
.scaleLinear()
.domain([0, d3.max(data, (d) => d.value)])
.range([margin.left, width]);
var y = d3
.scaleBand()
.domain(d3.range(data.length))
.rangeRound([margin.top, height - margin.top ])
.padding(0.2);
svg
.append("g")
.attr("class", "y-axis")
.attr("transform", `translate(${margin.left}, 0)`)
.call(
d3
.axisLeft(y)
.tickFormat((i) => data[i].name)
.tickSizeOuter(10)
);
svg
.append("g")
.attr("fill", "steelblue")
.selectAll("rect")
.data(data)
.join("rect")
.attr("x", x(0))
.attr("y", (d, i) => y(i))
.attr("width", (d) => x(d.value) - x(0))
.attr("height", y.bandwidth());
svg
.append("g")
.attr("fill", "white")
.attr("text-anchor", "end")
.attr("font-family", "sans-serif")
.attr("font-size", 12)
.selectAll("text")
.data(data)
.join("text")
.attr("x", (d) => x(d.value) - 4)
.attr("y", (d, i) => y(i) + y.bandwidth() / 2)
.attr("dy", "0.35em")
.text((d) => d3.format(".0%")(d.value));
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.15.0/d3.min.js"></script>

Answer 2

Substracting margin.top to height in the rangeRound definition is one way to fix the problem.
This is necessary because the SVG is created with a height where the margin value has already been substracted.
var y = d3
.scaleBand()
.domain(d3.range(data.length))
.rangeRound([margin.top, height - margin.top])
Demo in the snippet below.
var data = [
{ name: "0-18", value: 0.07507 },
{ name: "19-30", value: 0.01492 },
{ name: "31-50", value: 0.02782 },
{ name: "51-70", value: 0.04253 },
];
var margin = { left: 100, top: 10, right: 10, bottom: 100 };
var width = 600 - margin.left - margin.right;
var height = 400 - margin.top - margin.bottom;
var svg = d3
.select("body")
.append("svg")
.attr("width", width)
.attr("height", height);
var x = d3
.scaleLinear()
.domain([0, d3.max(data, (d) => d.value)])
.range([margin.left, width]);
var y = d3
.scaleBand()
.domain(d3.range(data.length))
.rangeRound([margin.top, height - margin.top])
.padding(0.2);
svg
.append("g")
.attr("class", "y-axis")
.attr("transform", `translate(${margin.left}, 0)`)
.call(
d3
.axisLeft(y)
.tickFormat((i) => data[i].name)
.tickSizeOuter(10)
);
svg
.append("g")
.attr("fill", "steelblue")
.selectAll("rect")
.data(data)
.join("rect")
.attr("x", x(0))
.attr("y", (d, i) => y(i))
.attr("width", (d) => x(d.value) - x(0))
.attr("height", y.bandwidth());
svg
.append("g")
.attr("fill", "white")
.attr("text-anchor", "end")
.attr("font-family", "sans-serif")
.attr("font-size", 12)
.selectAll("text")
.data(data)
.join("text")
.attr("x", (d) => x(d.value) - 4)
.attr("y", (d, i) => y(i) + y.bandwidth() / 2)
.attr("dy", "0.35em")
.text((d) => d3.format(".0%")(d.value));
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.15.0/d3.min.js"></script>