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    <p>I would argue that counting line breaks as two characters when calculating selection boundaries/cursor position is the correct approach. Fundamentally, those two characters <code>\r\n</code> are there in the text. They are present in the textarea's <code>value</code> property and they are in the value that is submitted to the server.</p> <p>The only arguments I can see for counting line breaks as one character are:</p> <ol> <li>Consistency with other browsers</li> <li>IE's <code>TextRange</code> methods consider the line breaks as one character</li> </ol> <p>I think neither is valid. Firstly, IE is already inconsistent with other browsers in counting line breaks as two characters rather than one. Secondly, IE's <code>TextRange</code> character-based methods are a little insane anyway, causing problems wherever they're used.</p> <p>I think it makes total sense to consider the selection/caret position as a position relative to the actual text in the textarea. This allows easy manipulation of the text.</p> <p>Here are two main functions. The first is the only textarea selection/caret position getting function I've seen that works correctly with all line breaks. You can find this here: <a href="https://stackoverflow.com/questions/3053542/how-to-get-the-start-and-end-points-of-selection-in-text-area/3053640#3053640">How to get the start and end points of selection in text area?</a>. Second, here's a complementary <code>setSelection</code> function:</p> <pre><code>function offsetToRangeCharacterMove(el, offset) { return offset - (el.value.slice(0, offset).split("\r\n").length - 1); } function setSelection(el, startOffset, endOffset) { var range = el.createTextRange(); var startCharMove = offsetToRangeCharacterMove(el, startOffset); range.collapse(true); if (startOffset == endOffset) { range.move("character", startCharMove); } else { range.moveEnd("character", offsetToRangeCharacterMove(el, endOffset)); range.moveStart("character", startCharMove); } range.select(); } </code></pre>
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