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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/SVGGraphicsElement/getBBox below:

SVGGraphicsElement: getBBox() method - Web APIs

Baseline Widely available

The SVGGraphicsElement.getBBox() method allows us to determine the coordinates of the smallest rectangle in which the object fits. The coordinates returned are with respect to the current SVG space (after the application of all geometry attributes on all the elements contained in the target element).

Note: getBBox() must return the actual bounding box at the time the method was called—even in case the element has not yet been rendered. It also does not account for any transformation applied to the element or its parents.

Note: getBBox returns different values than getBoundingClientRect(), as the latter returns value relative to the viewport

getBBox()
getBBox(options)

options Experimental Optional

An options dictionary used to control which parts of the element are included in the bounding box. The available options are:

fill

A boolean value indicating that the fill should be included in the bounding box, defaults to true.

stroke

A boolean value indicating that the stroke should be included in the bounding box, defaults to false.

markers

A boolean value indicating that the markers should be included in the bounding box, defaults to false.

clipped

A boolean value indicating that the bounding box should be clipped, defaults to false.

The returned value is an SVGRect object, which defines the bounding box. This value is irrespective of any transformation attribute applied to it or the parent elements.

<svg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg">
  <g id="group_text_1">
    <text x="5" y="16" transform="scale(2, 2)">Hello World!</text>
    <text x="8" y="32" transform="translate(0 20) scale(1.25 1)">
      Hello World Again!
    </text>
  </g>
  <!-- Shows BBox in green -->
  <rect id="rect_1" stroke="green" stroke-width="3" fill="none"></rect>
  <!-- Shows BoundingClientRect in red -->
  <rect id="rect_2" stroke="red" stroke-width="3" fill="none"></rect>
</svg>

const rectBBox = document.querySelector("#rect_1");
const rectBoundingClientRect = document.querySelector("#rect_2");
const groupElement = document.querySelector("#group_text_1");

const bboxGroup = groupElement.getBBox();
rectBBox.setAttribute("x", bboxGroup.x);
rectBBox.setAttribute("y", bboxGroup.y);
rectBBox.setAttribute("width", bboxGroup.width);
rectBBox.setAttribute("height", bboxGroup.height);

const boundingClientRectGroup = groupElement.getBoundingClientRect();
rectBoundingClientRect.setAttribute("x", boundingClientRectGroup.x);
rectBoundingClientRect.setAttribute("y", boundingClientRectGroup.y);
rectBoundingClientRect.setAttribute("width", boundingClientRectGroup.width);
rectBoundingClientRect.setAttribute("height", boundingClientRectGroup.height);

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