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    <div class="moz-cite-prefix">The simple solution would be to try to
      contact the people behind some of these websites and simply asking
      how they do it. That might provide useful answers to whether any
      encoding solution will be taken up by implementers.</div>
    <div class="moz-cite-prefix"><br>
    </div>
    <div class="moz-cite-prefix">A./<br>
    </div>
    <div class="moz-cite-prefix"><br>
    </div>
    <div class="moz-cite-prefix">On 10/10/2020 3:02 PM, Kent Karlsson
      via Unicode wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:A04CA5BD-A928-4EC1-9327-E21E2E9B4CFA@bahnhof.se">
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      <br class="">
      <div><span style="font-family: Calibri, sans-serif; font-size:
          11pt;" class="">Here are a few more web sites showing Teletext
          pages from various European TV channels.</span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">THE LIST IS SURELY FAR FROM COMPLETE, it is just a
          sample. But it does show that Teletext</span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">is commonly displayed as web pages, not just via TV
          channels (whether "analog" or DVB).</span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class=""> </span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">I haven't seen these combined with web versions of TV
          channels, but that would surely</span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">be possible to combine. That would be especially
          useful for optional subtilting, where</span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">Teletext is still much used, as a useful
          accessibility feature.</span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class=""> </span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">I have no prediction of how long any channels will
          continue to produce Teletext content.</span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">But optional subtilting seems to "survive" longer.</span><br
          class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class=""> </span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">I do not know what source format(s) may be used, but
          it is surely not HTML</span> <span style="font-family:
          Calibri, sans-serif; font-size: 11pt;" class="">*nor* close</span></div>
      <div><span style="font-family: Calibri, sans-serif; font-size:
          11pt;" class="">to the Teletext protocol. But see the Teletext
          page edit tool referenced below.</span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class=""> </span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class=""> </span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">Spain, RTVE:</span><br class="">
        <a href="https://www.rtve.es/television/teletexto/100/" class=""
          style="font-family: Calibri, sans-serif; font-size: 11pt;"
          moz-do-not-send="true">https://www.rtve.es/television/teletexto/100/</a><br
          class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class=""> </span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">Sweden, SVT:</span><br class="">
        <a href="https://texttv.nu/" class="" style="font-family:
          Calibri, sans-serif; font-size: 11pt;" moz-do-not-send="true">https://texttv.nu/</a> <span
          style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">(also as iOS app, same name)</span><br class="">
        <a href="https://www.svt.se/svttext/web/pages/100.html" class=""
          style="font-family: Calibri, sans-serif; font-size: 11pt;"
          moz-do-not-send="true">https://www.svt.se/svttext/web/pages/100.html</a><br
          class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class=""> </span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">Iceland, RÚV:</span><br class="">
        <a href="http://textavarp.is/sida/100" class=""
          style="font-family: Calibri, sans-serif; font-size: 11pt;"
          moz-do-not-send="true">http://textavarp.is/sida/100</a><br
          class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class=""> </span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">Denmark, DR:</span><br class="">
        <a href="https://www.dr.dk/cgi-bin/fttx1.exe/100" class=""
          style="font-family: Calibri, sans-serif; font-size: 11pt;"
          moz-do-not-send="true">https://www.dr.dk/cgi-bin/fttx1.exe/100</a><br
          class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class=""> </span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">Norway, NRK:</span><br class="">
        <a href="https://www.nrk.no/tekst-tv/100/" class=""
          style="font-family: Calibri, sans-serif; font-size: 11pt;"
          moz-do-not-send="true">https://www.nrk.no/tekst-tv/100/</a><br
          class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class=""> </span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">Finland, YLE:</span><br class="">
        <a href="https://yle.fi/aihe/tekstitv" class=""
          style="font-family: Calibri, sans-serif; font-size: 11pt;"
          moz-do-not-send="true">https://yle.fi/aihe/tekstitv</a><br
          class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class=""> </span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">Switzerland, SRF:</span><br class="">
        <a href="https://www.teletext.ch/" class="" style="font-family:
          Calibri, sans-serif; font-size: 11pt;" moz-do-not-send="true">https://www.teletext.ch/</a><br
          class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class=""> </span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">Croatia, HRT:</span><br class="">
        <a href="https://teletekst.hrt.hr/" class="" style="font-family:
          Calibri, sans-serif; font-size: 11pt;" moz-do-not-send="true">https://teletekst.hrt.hr/</a><br
          class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class=""> </span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">Greece:</span><br class="">
        <a href="https://www.greektvidents.com/Teletext_ERTEXT.shtml"
          class="" style="font-family: Calibri, sans-serif; font-size:
          11pt;" moz-do-not-send="true">https://www.greektvidents.com/Teletext_ERTEXT.shtml</a><br
          class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class=""> </span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">And more; I have not done a complete survey!</span><br
          class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class=""> </span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">There are also several apps for iOS and for Android
          that display Teletext content from</span></div>
      <div><span style="font-family: Calibri, sans-serif; font-size:
          11pt;" class="">various (TV channel) providers.</span><br
          class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class=""> </span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">What the source format is for the Teletext pages as
          produced today, I don't know. But I would</span></div>
      <div><span style="font-family: Calibri, sans-serif; font-size:
          11pt;" class="">guess</span> <span style="font-family:
          Calibri, sans-serif; font-size: 11pt;" class="">that it is
          likely "plain text" files, with Teletext specific markup, that
          is then converted to</span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">1) Teletext analog format, 2) Teletext DVB format, 3)
          HTML. But that is just my guess.</span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class=""> </span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">Again note that Teletext is still commonly used for
          optional subtitles. (DVB subtitles, a "bitmapped"</span><br
          class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">format (i.e. the subtitles are sent as images, not
          text) does not seem to be used much. At least, I</span><br
          class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">haven't seen it.) This requires timing, which is not
          part of the Teletext protocol, but must be in</span><br
          class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">the source in order to control when a subtitle is
          output as Teletext for optional display.</span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class=""> </span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class=""> </span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">So</span> <br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">   "But a teletext application for a modern computer
          is not "normal use." It is reasonable</span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">   for a non-standard application like this to
          interpret characters from U+0000 to U+001F</span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">   as the corresponding ISO 646 characters would be
          in teletext."</span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">is very false.</span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class=""> </span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">Further, the "object" overrides in the Teletext
          *protocol*, in several levels, "objects"</span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">prioritized depending on "implementation level", can
          specify:</span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">1) Bold, italic, underline, proportional font.</span><br
          class="">
        <font class="" face="Calibri, sans-serif"><span
            style="font-size: 11pt;" class="">2) More colours (but only
            16 levels per red/green/blue, no </span><span
            style="font-size: 14.666666984558105px;" class="">transparency</span><span
            style="font-size: 11pt;" class=""> though).</span></font><br
          class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">3) Character substitutions (likely replacing spaces)
          to be able to display characters from "G3".</span><br class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class="">These cannot be handled by "retaining" the
          ill-designed control codes of Teletext anyway.</span><br
          class="">
        <span style="font-family: Calibri, sans-serif; font-size: 11pt;"
          class=""> </span></div>
      <div><span style="font-family: Calibri, sans-serif; font-size:
          11pt;" class=""><br class="">
        </span></div>
      <div><font class="" face="Calibri, sans-serif"><span
            style="font-size: 11pt;" class="">Have an </span><span
            style="font-size: 14.666666984558105px;" class="">urge</span><span
            style="font-size: 11pt;" class=""> to edit your own Teletext
            pages? Here</span><span style="font-size:
            14.666666984558105px;" class="">’</span><span
            style="font-size: 11pt;" class="">s the web page for doing
            just that:</span></font></div>
      <div><font class="" face="Calibri, sans-serif"><span
            style="font-size: 11pt;" class=""><br class="">
          </span></font></div>
      <div><font class="" face="Calibri, sans-serif"><span
            style="font-size: 14.666666984558105px;" class=""><a
              href="https://zxnet.co.uk/teletext/editor" class=""
              moz-do-not-send="true">https://zxnet.co.uk/teletext/editor</a></span></font></div>
      <div><font class="" face="Calibri, sans-serif"><span
            style="font-size: 14.666666984558105px;" class=""><br
              class="">
          </span></font></div>
      <div><font class="" face="Calibri, sans-serif"><span
            style="font-size: 14.666666984558105px;" class="">You can
            save your page in a handful of formats (plus as image). I
            haven’t analyzed these formats,</span></font></div>
      <div><font class="" face="Calibri, sans-serif"><span
            style="font-size: 14.666666984558105px;" class="">but
            presumably they are storage formats actually used for ”real”
            Teletext pages that are converted</span></font></div>
      <div><font class="" face="Calibri, sans-serif"><span
            style="font-size: 14.666666984558105px;" class="">to be
            transmitted (”analog” (outdated) or DVB) or given as web
            pages (HTML, but no ”separated</span></font></div>
      <div><font class="" face="Calibri, sans-serif"><span
            style="font-size: 14.666666984558105px;" class="">mosaic”
            characters, since they are not yet allocated in Unicode;
            could use small images though...).</span></font></div>
      <div><font class="" face="Calibri, sans-serif"><span
            style="font-size: 14.666666984558105px;" class=""><br
              class="">
          </span></font></div>
      <div><font class="" face="Calibri, sans-serif"><span
            style="font-size: 14.666666984558105px;" class="">/Kent K</span></font></div>
      <div><font class="" face="Calibri, sans-serif"><span
            style="font-size: 14.666666984558105px;" class=""><br
              class="">
          </span></font></div>
    </blockquote>
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