How to linebreak an svg text within javascript?

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This is not something that SVG 1.1 supports. SVG 1.2 does have the textArea element, with automatic word wrapping, but it’s not implemented in all browsers. SVG 2 does not plan on implementing textArea, but it does have auto-wrapped text.

However, given that you already know where your linebreaks should occur, you can break your text into multiple <tspan>s, each with x="0" and dy="1.4em" to simulate actual lines of text. For example:

<g transform="translate(123 456)"><!-- replace with your target upper left corner coordinates -->
  <text x="0" y="0">
    <tspan x="0" dy="1.2em">very long text</tspan>
    <tspan x="0" dy="1.2em">I would like to linebreak</tspan>
  </text>
</g>

Of course, since you want to do that from JavaScript, you’ll have to manually create and insert each element into the DOM.

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