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    <div class="moz-cite-prefix">Hello,</div>
    <div class="moz-cite-prefix"><br>
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    <div class="moz-cite-prefix">Yes. As of version 21 this is a
      limitation of Web Author. However it will be supported in the next
      version (already implemented in the nightly builds).<br>
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    <div class="moz-cite-prefix"><br>
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    <div class="moz-cite-prefix">Best,</div>
    <div class="moz-cite-prefix">Cristian<br>
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    <div class="moz-cite-prefix"><br>
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    <div class="moz-cite-prefix">On 3/5/2019 12:28 PM, Jirka Kosek
      wrote:<br>
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      cite="mid:9206d016-2826-52ad-e38f-e042386e198f@kosek.cz">
      <pre class="moz-quote-pre" wrap="">Hi,

I'm implementing support for inserting manual line-breaks into content.
This is done as processing instruction <?br?>. In an Author mode I can
get reasonable rendering by using the following CSS rules:

oxy|processing-instruction[br]::before {
  content: "[";
}

oxy|processing-instruction[br]::after {
  content: "]\a";
  white-space: pre;
}


However in Web Autor these rules are ignored although I don't see this
kind of usage listed as unsupported at
<a class="moz-txt-link-freetext" href="https://www.oxygenxml.com/doc/versions/21.0.0/ug-waCustom/topics/webapp_css_limitations.html">https://www.oxygenxml.com/doc/versions/21.0.0/ug-waCustom/topics/webapp_css_limitations.html</a>

If this is just undocumented limitation is there any other way how to
implement this in Web Author?

Many thanks in advance,

                                Jirka

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