The getExtentOfChar() method of the SVGTextContentElement interface the represents computed tight bounding box of the glyph cell that corresponds to a given typographic character.
getExtentOfChar(index)indexAn integer; the index of the character.
A DOMRect object; the tight bounding box of the specified character.
IndexSizeError DOMExceptionThrown if no character is found at index.
<svg width="300" height="100">
<text id="exampleText" x="10" y="50" font-size="16">Hello, SVG World!</text>
</svg>const textElement = document.getElementById("exampleText");
// Get the extent (bounding box) of the character at index 0 (the first character)
const extent = textElement.getExtentOfChar(0);
// The bounding box of the first character
console.dir(extent); // Output: DOMRect { x: 10, y: 38, width: 11.55, height: 16 }