Meta: modernize a bit

* Replace Bugzilla file bug link with GitHub file issue link
* Add Can I Use panels
* Avoid RFC2119 keywords in non-normative text
* Syntax highlight code examples

Author: zcorpan

geometry/Overview.bs

@@ -14,29 +14,40 @@ Previous Version: https://www.w3.org/TR/2013/WD-matrix-20130919/
 Group: fxtf
 Ignored Terms: float32array, float64array, indexsizeerror, DOMString, boolean
 Link Defaults: css-transforms-1 (type) <transform-list>/<transform-function>, css-transforms-1 (function) matrix3d()/matrix()
-Editor: Simon Pieters, Opera Software ASA, simonp@opera.com
+Editor: Simon Pieters, Opera Software AS, simonp@opera.com
 Editor: Dirk Schulze, Adobe Systems Inc., dschulze@adobe.com
 Editor: Rik Cabanier, Adobe Systems Inc., cabanier@adobe.com
 Abstract: This specification provides basic geometric interfaces to represent points, rectangles, quadrilaterals and transformation matrices that can be used by other modules or specifications.
-!Issues list: <a href="https://www.w3.org/Bugs/Public/buglist.cgi?product=FXTF&amp;component=Geometry&amp;resolution=---">Bugzilla</a> (<a href="https://www.w3.org/Bugs/Public/enter_bug.cgi?product=FXTF&amp;component=Geometry">file a bug</a>)
+!Issues list: <a href="https://github.com/w3c/fxtf-drafts/issues?utf8=✓&q=is%3Aissue%20is%3Aopen%20label%3Ageometry-1%20">Open issues</a> (<a href="https://github.com/w3c/fxtf-drafts/issues/new?title=[geometry]%20" id="file-issue-link">file an issue</a>)
+!Issues list: <a href="https://www.w3.org/Bugs/Public/buglist.cgi?product=FXTF&amp;component=Geometry&amp;resolution=---">Legacy open bugs</a>
 Test Suite: http://test.csswg.org/suites/geometry-1_dev/nightly-unstable/
 Use <i> Autolinks: no
 Ignored Vars: a, b, f, Point object, m44, e, m42, quad1, m41, stringifier, point object, m12, c, transformPoint, m21, d, m22, quad2, sz
+Include Can I Use Panels: true
+Can I Use URL: https://drafts.fxtf.org/geometry/
+Can I Use URL: https://www.w3.org/TR/geometry-1/
+Ignore Can I Use URL Failure: https://drafts.fxtf.org/geometry/
+Ignore Can I Use URL Failure: https://www.w3.org/TR/geometry-1/
+Complain About: accidental-2119 true
+Default Highlight: javascript
 </pre>
 
 <pre class=anchors>
 type: exception; text: SyntaxError; url: https://html.spec.whatwg.org/multipage/infrastructure.html#js-syntaxerror
 </pre>
 
-<script src=https://resources.whatwg.org/file-bug.js async></script>
+<script src=https://resources.whatwg.org/file-issue.js async></script>
 <script src="../shared/MathJax/MathJax.js?config=MML_SVGorMML,local/local"></script>
 
-<style type="text/css">
-a[data-link-type=element]::before,span[data-link-type=element]::before {
-  content: '<';
-}
-a[data-link-type=element]::after,span[data-link-type=element]::after {
-  content: '>';
+<style>
+a.selected-text-file-an-issue {
+  position: fixed;
+  bottom: 0;
+  right: 0;
+  background: rgba(255, 255, 255, 0.8);
+  font-size: smaller;
+  padding: 4px 10px;
+  z-index: 4;
 }
 </style>
 
@@ -410,7 +421,9 @@ var quad2 = DOMQuad.fromRect(rect);</code></pre>
 <h2 id='DOMMatrix'>
 The DOMMatrix interfaces</h2>
 
-The <a interface>DOMMatrix</a> and <a interface>DOMMatrixReadOnly</a> interfaces each represent a mathematical <dfn>matrix</dfn> with the purpose of describing transformations in a graphical context. The following sections describe the details of the interface.
+The <a interface>DOMMatrix</a> and <a interface>DOMMatrixReadOnly</a> interfaces each represent a
+mathematical <dfn caniuse=dommatrix>matrix</dfn> with the purpose of describing transformations in a
+graphical context. The following sections describe the details of the interface.
 
 <div class="figure">
   <!--<img src="images/4x4matrix.png" alt="4x4 matrix with items m11 to m44">-->
@@ -1050,7 +1063,9 @@ matrix.translateSelf(20, 20).scaleSelf(2).translateSelf(-20, -20);
 </code></pre>
 </div>
 
-Note: Authors who use chained method calls are recommended to use mutable transformation methods to avoid unnecessary memory allocations due to creation of intermediate DOMMatrix objects in User Agents.
+Note: Authors who use chained method calls are advised to use mutable transformation methods to
+avoid unnecessary memory allocations due to creation of intermediate {{DOMMatrix}} objects in user
+agents.
 
 <dl dfn-type=method dfn-for=DOMMatrix>
   <dt><dfn>multiplySelf(<var>other</var>)</dfn></dt>