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    <p>Hi Frank,</p>
    <p><br>
    </p>
    <p>There are two distinct aspects to this:</p>
    <p><br>
    </p>
    <p>1) Installing your framework in Oxygen and editing a DITA topic
      in the Author mode using your custom framework's CSS. I tested and
      on my side Oxygen reports no error when opening and editing a DITA
      topic with your framework. So I cannot reproduce this problem you
      reported:</p>
    <p><br>
    </p>
    <p>
      <blockquote type="cite">This is annoying because the "Results"
        window keeps popping up whenever I save a dita file.</blockquote>
      2) Opening your "custom.css" in Oxygen and validating it. Here
      indeed some errors are reported.</p>
    <p><br>
    </p>
    <p>2.1) <br>
    </p>
    <p><br>
    </p>
    <p>
      <blockquote type="cite">Unknown pseudo-element or pseudo-class
        “:no-tags”</blockquote>
      You can avoid this error by prefixing the custom pseudo class with
      "-oxy-", something like ":root:-oxy-no-tags".</p>
    <p>Also make sure you prefix the pseudo class value also in the
      oxy_action.</p>
    <p><br>
    </p>
    <p>2.2)</p>
    <p><br>
    </p>
    <p>
      <blockquote type="cite">“-2em” negative values are not allowed :</blockquote>
      Such errors are reported by the W3C CSS validator, the CSS is
      considered invalid according to the CSS standard. We do not have
      settings to filter out errors reported by the CSS validator.</p>
    <p><br>
    </p>
    <p>2.3)</p>
    <p><br>
    </p>
    <p>
      <blockquote type="cite">Property “margin-inline-start” doesn't
        exist : 0</blockquote>
      Again this property does not see to be defined in the CSS3
      standard and is reported as such by the W3C CSS validator. We do
      not have a way to inhibit this.</p>
    <p>Oxygen's CSS engine used to render DITA topics in the Author mode
      does not support this "margin-inline-start" property or use it in
      any way. But some browsers seem to support it.<br>
    </p>
    <p><br>
    </p>
    <p>Regards,</p>
    <p>Radu</p>
    <pre class="moz-signature" cols="72">Radu Coravu
Oxygen XML Editor</pre>
    <p></p>
    <p><br>
    </p>
    <div class="moz-cite-prefix">On 1/18/23 11:30, Frank Dissinger
      wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:94620126-e54d-ca0e-3985-fe07a16f7cc4@cgs-oris.com">
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      <p>Hi list,</p>
      <p><br>
      </p>
      <p>I keep getting the following CSS validation errors for my
        "custom.css" file in oXygen V25: </p>
      <ul>
        <li>Unknown pseudo-element or pseudo-class “:no-tags”</li>
        <li>Negative values are not allowed: -0.5em <i>(padding)</i></li>
        <li>Property “margin-inline-start” doesn't exist : 0</li>
      </ul>
      <p>This is annoying because the "Results" window keeps popping up
        whenever I save a dita file.</p>
      <p><br>
      </p>
      <p>How can I tell oXygen to ignore these
        elements/properties/values?</p>
      <p>I can't find the required settings under "Options >
        Preferences > CSS Validator".</p>
      <p><br>
      </p>
      <p>Frank<br>
      </p>
      <div class="moz-signature">-- <br>
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              <p><strong>Frank Dissinger</strong></p>
              <p>Documentation Manager</p>
              <p>....................................................................</p>
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