How can I draw text using SVG.js?

I am trying to figure out how to use SVG.js to draw text. In my attempt below, the text is being created and drawn, but only a few dots show up. This must be part of the text being drawn, but it is being clipped. I am not sure why this clipping is happening or how to fix it.

My end goal is to create an SVG with text fitted inside some geometry. To do this, I need to measure the text first so I can compute the geometry dimensions. Therefore, it is important to me to create the SVG object before adding the SVG to a DOM element.

For the code below, what do I need to do so the text show up correctly?

const draw = SVG().size(300, 300);

const text = draw.text("000000000");

text.attr({
  fill: "red",
  stroke: "green",
  "font-family": "Roboto",
  "font-size": 10
});

const bbox = draw.bbox()

console.log( bbox );

draw.addTo("#rectID");

<script src="https://cdn.jsdelivr.net/npm/@svgdotjs/[email protected]/dist/svg.min.js"></script>

<div id="rectID">
</div>

Solution

As explained by Fuzzyma:
the bbox is calculated by creating a temporarily appended DOM element.

In fact this approach should work flawlessly without any layout shifts.

Your main problem is the off canvas position of the <text> element.
Here's an example generating a horizontally and vertically centered <text> element with a <rect> in the background.
The SVG's markup is returned via svg() method.

const draw = SVG().size(300, 300);
// draw background rect
const rect = draw.rect();
const text = draw.text("000000000");

text.attr({
  fill: "red",
  "font-family": "Roboto",
  "font-size": 50,
  x: "50%",
  y: "50%",
  "text-anchor": "middle",
  "dominant-baseline" : 'middle'
});

// get bounding box
const bbox = draw.bbox();

// adjust rect dimensions according to bbox
rect.attr({
  x: bbox.x,
  y: bbox.y,
  width: bbox.width,
  height: bbox.height,
  fill: "#ccc",
  stroke: "green"
});


// get markup
let markup = draw.svg()
output.value = markup;

function render(){
  document.body.insertAdjacentHTML('beforeend', markup)
}

svg{
  border:1px solid #ccc;
}

textarea{
  width:100%;
  min-height:10em
}

<script src="https://cdn.jsdelivr.net/npm/@svgdotjs/[email protected]/dist/svg.min.js"></script>

<h3>SVG markup</h3>
<textarea id="output"></textarea>

<p><button onclick="render()">Render SVG</button></p>

As you can see we can also retrieve the SVG markup without rendering the element - albeit the bbox calculation requires some temporary invisible rendering.