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    <h1>Selection</h1>
    <p>The act of selecting a block of text to replace or to surround 
    with an element is performed the same in Vex as in most word 
    processors: by moving the caret while holding the <b>Shift</b> key 
    or by dragging the mouse between two positions. The main difference 
    is that in some cases, Vex will expand the selection so that it 
    does not span only a portion of an element.</p>
    <p>To see this in action, place the caret in the middle of an 
    inline element containing some text. While holding the <b>Shift</b> 
    key, move the caret towards the end of the element. As the caret 
    passes the end marker for the element, note that the starting point 
    of the selection jumps to the start of the element. If you move the 
    caret back inside the element (while still holding <b>Shift</b>), 
    you'll notice that the start of the selection jumps back to its 
    original place.</p>
    <p>When a block element is selected, Vex draws an outline around 
    the entire block, showing the element name in the lower right 
    corner. This allows you to see that the entire element is selected 
    rather than just its contents.</p>
    <p>This selection behaviour is Vex's way of preserving the 
    structure of the document. It is based on the assumption that 
    normally you want to manage entire elements.</p>
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