LayoutTests/editing/selection/5195166-1.html

<p>This tests for a bug where extending a selection created with the mouse would blow it away before extending it.</p>
<div id="div" contenteditable="true">There should be five characters selected in this sentence.</div>
<ul id="console"></ul>
<script>
function log(str) {
    console = document.getElementById("console");
    li = document.createElement("li");
    text = document.createTextNode(str);
    console.appendChild(li);
    li.appendChild(text);
}
if (window.layoutTestController) {
    var text = document.getElementById("div").firstChild;
    var selection = window.getSelection();
    
    // FIXME: m_lastChangeWasHorizontalExtension isn't cleared in several places
    // where it should be, when opening a new document for example.
    selection.setPosition(text, 0);
    selection.modify("move", "forward", "character");
    
    selection.setBaseAndExtent(text, 3 + 5, text, 3);
    // Extending this 5 character selection will select 6 characters.
    layoutTestController.execCommand("MoveForwardAndModifySelection");
    // Extending it in this way flips the base and the extent.
    if (selection.extentOffset - selection.baseOffset != 6)
        log("Failure: Selection isn't the right size.");
    else
        log ("Success");
} else
    log ("Failure: This test cannot be run manually.")
</script>