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</head>
<body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; color: rgb(0, 0, 0);">
<div>Thanks, Vlad and Jonathan, for moving these changes forward (these changes were brought up after the final report of the W3C was published).</div>
<div><br>
</div>
<div>The “Glyph rendering” section’s “Security” sub-section already describes the current restrictions on the glyphs:</div>
<div><br>
</div>
<div>>>></div>
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<![endif]--><!--StartFragment--><span lang="EN" style="line-height: 115%;">It
is required that all rendering of SVG glyphs be done in the “secure animated mode” or “secure static mode” specified in the W3C document
</span><span style="line-height: 115%;"><a href="https://svgwg.org/specs/integration/"><span lang="EN">SVG Integration</span></a></span><span lang="EN" style="line-height: 115%;">. These modes permit
</span><span style="line-height: 115%;">no script execution, external references, interactivity, or link traversal</span><span lang="EN" style="line-height: 115%;">.</span><!--EndFragment-->
</div>
<div><span lang="EN" style="line-height: 115%;"><<<</span></div>
<div><br>
</div>
<div>So that seems the right place to indicate these additional restrictions.</div>
<div><br>
</div>
<div>I propose that the following be added to the end of that sub-section:</div>
<div><br>
</div>
<div>>>></div>
<div>In addition, rendering of the glyphs must ignore any SVG text elements and foreignObjects encountered.</div>
<div><<<</div>
<div><br>
</div>
<div>That should suffice for indicating that text elements and foreignObjects are not allowed, and also addresses Jonathan’s point about what the impl should do if it encounters them.</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Sairus</div>
<div style="font-size: 14px; font-family: Calibri, sans-serif;"><br>
</div>
<span id="OLK_SRC_BODY_SECTION" style="font-size: 14px; font-family: Calibri, sans-serif;">
<div style="font-family:Calibri; font-size:11pt; text-align:left; color:black; BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<span style="font-weight:bold">From: </span>Jonathan Kew <<a href="mailto:jfkthame@gmail.com">jfkthame@gmail.com</a>><br>
<span style="font-weight:bold">Date: </span>Tuesday, March 11, 2014 at 9:05 AM<br>
<span style="font-weight:bold">To: </span>Vladimir Levantovsky <<a href="mailto:Vladimir.Levantovsky@monotype.com">Vladimir.Levantovsky@monotype.com</a>>, "<a href="mailto:mpeg-OTspec@yahoogroups.com">mpeg-OTspec@yahoogroups.com</a>" <<a href="mailto:mpeg-OTspec@yahoogroups.com">mpeg-OTspec@yahoogroups.com</a>><br>
<span style="font-weight:bold">Subject: </span>Re: [mpeg-OTspec] comments re SVG table in the OFF draft<br>
</div>
<div><br>
</div>
<div>
<div style="background-color: #fff;"><span style="display:none"> </span>
<div id="ygrp-text">
<p>On 11/3/14 15:53, Levantovsky, Vladimir wrote:<br>
> Thank you Jonathan,<br>
><br>
> What you're proposing makes perfect sense but I also wonder if, in<br>
> light of the changes proposed by Cameron for UA style sheet we should<br>
> also extend the language of your proposed second sentence to say that<br>
> "The use of SVG text elements _and/or SVG foreign objects_ within<br>
> these glyph descriptions is prohibited."<br>
<br>
Sounds good to me. We should certainly mention the foreignObject <br>
prohibition somewhere, and this seems a logical place to include it.<br>
<br>
JK<br>
<br>
><br>
> Best regards, Vladimir<br>
><br>
><br>
>> -----Original Message----- From: <a href="mailto:mpeg-OTspec@yahoogroups.com">
mpeg-OTspec@yahoogroups.com</a><br>
>> [<a href="mailto:mpeg-OTspec@yahoogroups.com">mailto:mpeg-OTspec@yahoogroups.com</a>] On Behalf Of Jonathan Kew<br>
>> Sent: Tuesday, March 11, 2014 11:37 AM To: OTspec<br>
>> <<a href="mailto:mpeg-OTspec@yahoogroups.com">mpeg-OTspec@yahoogroups.com</a>> Subject: [mpeg-OTspec] comments re<br>
>> SVG table in the OFF draft<br>
>><br>
>> A few comments on the current 3rd ed. working draft:<br>
>><br>
>> - - - - -<br>
>><br>
>> First, the opening sentence in section "5.5.1 SVG - The SVG<br>
>> (Scalable Vector Graphics) table" seems problematic to me:<br>
>><br>
>> <quote> This table contains SVG [16] descriptions for some or all<br>
>> of the glyphs in the font, the use of SVG text elements for outline<br>
>> fill is prohibited. </quote><br>
>><br>
>> This would read much better if split into two sentences, not joined<br>
>> by a comma. And second, shouldn't the use of SVG text elements be<br>
>> prohibited for -any- purpose within the glyphs (not only for<br>
>> outline fill)? If we want to avoid glyph descriptions referring to<br>
>> external fonts, we can't allow SVG text elements to be stroked or<br>
>> used as clipping paths, for example.<br>
>><br>
>> So I suggest changing this to something like:<br>
>><br>
>> <proposed> This table contains SVG [16] descriptions for some or<br>
>> all of the glyphs in the font. The use of SVG text elements within<br>
>> these glyph descriptions is prohibited. </proposed><br>
>><br>
>> - - - - -<br>
>><br>
>> Further, we should specify what happens if an SVG text element is<br>
>> found (despite being prohibited): is that element ignored, but the<br>
>> remainder of the glyph rendered normally, or do we consider the<br>
>> entire glyph description invalid, and ignore it, falling back to a<br>
>> TrueType or CFF glyph?<br>
>><br>
>> Offhand, I'm inclined to favor the former: require the renderer to<br>
>> ignore the SVG text element(s), but proceed to do its best to<br>
>> render any other content. So I'd suggest an additional sentence<br>
>> such as:<br>
>><br>
>> <proposed> If any SVG text element is encountered within a glyph<br>
>> description, it MUST be ignored by the renderer. </proposed><br>
>><br>
>> - - - - -<br>
>><br>
>> Finally, forwarding a comment from Cameron McCormack regarding the<br>
>> description of "Glyph Rendering":<br>
>><br>
>> <forwarded> I don't think that added rule in the UA style sheet,<br>
>><br>
>> :root { font-size: 0 !important; }<br>
>><br>
>> is sufficient, since font-size can be specified on an element in<br>
>> the document. The importance of the rule doesn't inherit.<br>
>><br>
>> Instead, I think this would work:<br>
>><br>
>> @namespace svg url(<a href="http://www.w3.org/2000/svg">http://www.w3.org/2000/svg</a>);<br>
>><br>
>> svg|text, svg|foreignObject { display: none !important; }<br>
>><br>
>> Using |display: none| seems like a clearer description of what's<br>
>> going on, and should have the same effect as |font-size: 0|.<br>
>> </forwarded><br>
>><br>
>> This seems like a good change we should make to the draft.<br>
>><br>
>><br>
>> JK<br>
>><br>
>><br>
>> ------------------------------------<br>
<br>
</p>
</div>
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