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<p>
<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>
</p>
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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
2px rgba(20, 20, 20, 0.4);" moz-do-not-send="false"
class="myLogoAG" src="cid:part8.D614F77B.AAFDFF10@gmail.com"
alt="Get Thunderbird!" width="94" height="15">
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</div>
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<blockquote type="cite" style="margin-bottom: -20px !important;
padding-bottom:20px !important;">
<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>
</div>
<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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