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          <blockquote type="cite">Does that mean, in your opinion it
            should be fine to strip those, if the document author was
            careful?
            <br>
          </blockquote>
        </p>
        <p> Yes. you can't have both (encryption and dangerous rules).
          having said that, standard CSS rules should be supported as
          far as possible. <br>
        </p>
        <p>You can still craft stuff using visibility / negative margins
          and possibly animation, which I do not think can be reliably
          detected via an algortihm though.</p>
        <p>What's your thought on iFrames? Are they currently allowed?</p>
        <p>Axel<br>
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        <div id="SignatureAG"> <b class="myNameAG"><a
              href="mailto:axel.grude@gmail.com">Axel Grude</a></b> <br>
          Music Production and Composition <br>
          Thunderbird Add-ons Developer <span class="AddonList">(<a
href="https://addons.thunderbird.net/thunderbird/addon/quickfolders-tabbed-folders/">QuickFolders</a>,
            <a
              href="https://addons.thunderbird.net/thunderbird/addon/quickfilters/">quickFilters</a>,
            <a
              href="https://addons.mozilla.org/firefox/addon/quickpasswords/">QuickPasswords</a>,
            <a
              href="https://addons.thunderbird.net/thunderbird/addon/zombie-keys/">Zombie
              Keys</a>, <a
              href="https://addons.thunderbird.net/thunderbird/addon/smarttemplate4/">SmartTemplate⁴</a>)</span>
          <br>
          Visit my <a href="https://www.youtube.com/c/thunderbirddaily">YouTube
            Channel</a> for email productivity tips <img
            style="margin-top: 1em; float: right; box-shadow: 1px 1px
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      <blockquote type="cite" style="margin-bottom: -20px !important;
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        <div id="newHeaderAG1" style="font-size: x-small; padding:1em;
          background-color:rgba(220,220,240,0.4); border-radius:3px;"> <b>Subject:</b>Re:
          Product decision regarding HTML/CSS email and digital
          signatures<br>
          <b>From:</b>Kai Engert <a class="moz-txt-link-rfc2396E" href="mailto:kaie@kuix.de"><kaie@kuix.de></a><br>
          <b>To:</b><a class="moz-txt-link-abbreviated" href="mailto:Tb-Planning@mozilla.org">Tb-Planning@mozilla.org</a>
          <a class="moz-txt-link-rfc2396E" href="mailto:tb-planning@mozilla.org"><tb-planning@mozilla.org></a>; Axel Grude
          <a class="moz-txt-link-rfc2396E" href="mailto:axel.grude@gmail.com"><axel.grude@gmail.com></a> <br>
          <b>Sent: </b>Thursday, 3/12/2020 21:51<br>
        </div>
      </blockquote>
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    <blockquote type="cite"
      cite="mid:e02a52c2-b6af-221b-908b-d2b91fa04224@kuix.de">On
      03.12.20 22:16, Axel Grude wrote:
      <br>
      <blockquote type="cite">when you say "conditional rules" are you
        referring to @media stuff?
        <br>
      </blockquote>
      <br>
      Yes. We're currently filtering:
      <br>
      - @media
      <br>
      - @document
      <br>
      - @supports
      <br>
      - @import
      <br>
      <br>
      <br>
      <blockquote type="cite">I think that should degrade gracefully if
        some plain "ground rules" are added, too.
        <br>
      </blockquote>
      <br>
      Does that mean, in your opinion it should be fine to strip those,
      if the document author was careful?
      <br>
      <br>
      Thanks
      <br>
      Kai
      <br>
    </blockquote>
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