Hello all, though this seems to be an old thread, I solved read more with a different approach and it works well.
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Create one textbox for long text and another for short text (this gives you the flexibility of having a “summary” as short text and “description” as long text)
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Add two buttons, one “Read More” and the other “Read Less”
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Use onMouseIn event for both buttons to make respective textboxes and buttons visible or hidden
An added benefit for me was that on my mobile page, I kept only the “short text” visible, thus helping me with a clean look.