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Difference between revisions of "Diagrams in HTML"

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{{obsolete|spec=[http://www.whatwg.org/specs/web-apps/current-work/multipage/the-map-element.html#svg-0 HTML Standard: SVG]}}
Please put ideas for what it should look like here.
Please put ideas for what it should look like here.


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Tree construction recovers from errors by closing the <svg> element.
Tree construction recovers from errors by closing the <svg> element.


== <ext> ==
== Extensibility Element (<ext>) ==
 
<pre>
<p>Hello world.
    <ext>
      <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 10 10">
          <circle x="5" y="5 r="5" stroke="green"/>
      </svg>
    </ext>
</p>
</pre>
 
(The <ext> element would have a name that doesn't clash with existing content. Inside you can use XML.)


''Unfortunately, whatever syntax we end up using, people will copy and paste it from documents that were written by competent authors that tested it against the new UAs, into documents written by authors who don't know about this, and who don't have the new UA, thus creating new "legacy documents" that use whatever syntax we come up with. -Hixie''
Moved to [[Extensions#Proposal_2:_Extensibility_Element_.28.3Cext.3E.29|Extensions]], since this is a potentially generic mechanism.


''I think this risk is minimal, since it clearly wouldn't work in the legacy UAs, and so the mistake will have less reason to propagate. -Shepazu''
''Make sure to [http://software.hixie.ch/utilities/js/live-dom-viewer/?%3Chtml%20lang%3D%22en%22%3E%0A%3Chead%3E%0A%09%3Ctitle%3EHTML%20Extensibility%20Test%3C%2Ftitle%3E%0A%0A%3C%2Fhead%3E%0A%3Cbody%3E%0A%09%3Ch1%20id%3D%22test_of_extensibility%22%3ETest%20of%20Extensibility%3C%2Fh1%3E%0A%09%3Cp%3EThis%20is%20a%20test%20of%20an%20extensibility%20point%20in%20text%2Fhtml%2C%20with%20a%20fallback%20mechanism.%3C%2Fp%3E%0A%09%0A%09%3Cext%3E%0A%09%09%3Cfallback%3E%0A%09%09%09%3Cimg%20src%3D%22image%22%2F%3E%0A%09%09%3C%2Ffallback%3E%0A%09%09%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%0A%09%09%20%20%20%20%20xmlns%3Axlink%3D%22http%3A%2F%2Fwww.w3.org%2F1999%2Fxlink%22%0A%09%09%20%20%20%20%20width%3D%22100%25%22%20height%3D%22100%25%22%0A%09%09%20%20%20%20%20version%3D%221.1%22%3E%0A%0A%09%09%09%3Ctitle%3EMy%20Title%3C%2Ftitle%3E%0A%09%09%09%3Cdesc%3Eschepers%2C%2001-04-2008%3C%2Fdesc%3E%0A%09%09%09%3Ccircle%20id%3D%22circle_1%22%20cx%3D%2275%22%20cy%3D%2225%22%20r%3D%2220%22%20fill%3D%22lime%22%20%2F%3E%0A%09%09%3C%2Fsvg%3E%09%09%0A%09%3C%2Fext%3E%0A%0A%3C%2Fbody%3E%0A%3C%2Fhtml%3E test your proposals]... :-)''
 
We should define a content model for where the <ext> element can occur, and if there are implications for different locations (such as inside a table, a paragraph, the head, etc). The simplest thing, at least for SVG (and probably MathML), would be that it would have the same restrictions as an <img> element. Also, there should be a default block model for <ext> in CSS.
 
Note that this is similar to IE's "XML islands" with the <xml> element. It's believed that there are some conflicts with the <xml> element itself, since it creates a separate document that is tied to the <xml> element in the DOM, but more research is needed.
 
'''What's the error handling intended to be for this idea? How is embedded HTML handled?'''


== <svg> as document element ==
== <svg> as document element ==
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</svG>
</svG>
</pre>
</pre>
<font color="red">''It's not clear that authoring would be easier with looser error handling, and introduces the incompatibilities mentioned above.  A safer approach would be to first introduce the more conservative syntax, then observe how it is used and specify from real-world use cases incrementally.  It's also not clear how this is to be distinguished from SVG content with embedded HTML (MIME Type?).  -Shepazu''</font>

Latest revision as of 16:07, 10 November 2012

This document is obsolete.

For the current specification, see: HTML Standard: SVG


Please put ideas for what it should look like here.

Each example should have a green circle, with an embedded HTML table, and should say how to handle tokeniser errors and tree construction errors.

Hardcoded element names

 <p>
   Hello world.
   <svg viewbox="0 0 10 10">
     <circle x=5 y=5 r=5 stroke=green>
     <foreignObject> <table><tr><td>1<td>2<tr><td>3<td>4</table> </foreignObject>
   </svg>
 </p>

Tokeniser recovers from errors by ignoring them and moving on.

Tree construction recovers from errors by closing the <svg> element.

Extensibility Element (<ext>)

Moved to Extensions, since this is a potentially generic mechanism.

Make sure to test your proposals... :-)

<svg> as document element

This is not a syntax proposal but I'd like to able to have SVG graphics in text/html without the need to wrap it inside HTML and without having implied <html>, <body>, etc. (I being Anne.)

Rationale:

  • It's often easier to generate text/html documents than other types of documents (Live DOM Viewer, PHP)
  • It allows you to use text/html-style syntax for SVG graphics which makes authoring easy.
  • It makes creating graphics that use features from HTML and MathML easier.
<svg viewbox="0 0 10 10">
  <circle x=5 y=5 r=5 fill=lime>
  <foreignObject> <table><tr><td>1<td>2<tr><td>3<td>4</table> </foreignOBJECT>
</svG>

It's not clear that authoring would be easier with looser error handling, and introduces the incompatibilities mentioned above. A safer approach would be to first introduce the more conservative syntax, then observe how it is used and specify from real-world use cases incrementally. It's also not clear how this is to be distinguished from SVG content with embedded HTML (MIME Type?). -Shepazu