def METHOD_NAME():
    # Deactivate kerning
    page, = render_pages('''
      <style>
        @font-face {
          src: url(weasyprint.otf);
          font-family: no-kern;
          font-feature-settings: 'kern' off;
        }
        @font-face {
          src: url(weasyprint.otf);
          font-family: kern;
        }
        span:nth-child(1) { font-family: kern }
        span:nth-child(2) { font-family: no-kern }
      </style>
      <span>kk</span><span>kk</span>''')
    html, = page.children
    body, = html.children
    line, = body.children
    span1, span2 = line.children
    assert span1.width == 1.5 * 16
    assert span2.width == 2 * 16