Re: [whatwg/dom] Add validity criteria for StaticRange (#1009)

@annevk commented on this pull request.



> @@ -7650,6 +7650,20 @@ constructor steps are:
  <var>init</var>["{{StaticRangeInit/endOffset}}"]).
 </ol>
 
+<p>A {{StaticRange}} is <dfn for=StaticRange export>valid</dfn> if all of the following are true:
+
+<ul>
+ <li><p>Its <a for=range>start</a> and <a for=range>end</a> are in the same <a>node tree</a>.
+
+ <li><p>Its <a for=range>start offset</a> is between 0 and its <a for=range>start node</a>'s
+ <a>length</a>, inclusive.
+
+ <li><p>Its <a for=range>end offset</a> is between 0 and its <a for=range>end node</a>'s
+ <a>length</a>, inclusive.
+
+ <li><p>Its <a for=range>start</a> is <a for="boundary point">before</a> or
+ <a for="boundary point">equal</a> to its <a for=range>end</a>.
+</ul>

```suggestion
</ul>

```

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