def escape_html(text):
    """Replace <, >, &, " with their HTML encoded representation. Intended to
    prevent HTML errors in rendered displaCy markup.

    text (unicode): The original text.
    RETURNS (unicode): Equivalent text to be safely used within HTML.
    """
    text = text.replace('&', '&amp;')
    text = text.replace('<', '&lt;')
    text = text.replace('>', '&gt;')
    text = text.replace('"', '&quot;')
    return text