Allow implementations to kill worklets whenever, by default

Closes w3c/css-houdini-drafts#470.

Author: domenic

source

@@ -102389,17 +102389,18 @@ dictionary <dfn dictionary>WorkletOptions</dfn> {
   <code>Document</code> will <span data-x="terminate a worklet global scope">terminate</span> the
   corresponding <code>WorkletGlobalScope</code> and allow it to be garbage-collected.</p>
 
-  <p>Additionally, specifications which inherit from <code>WorkletGlobalScope</code> and define
-  specific worklet types can give more specific details on when to <span data-x="create a worklet
-  global scope">create</span> or <span data-x="terminate a worklet global scope">terminate</span>
-  the <code>WorkletGlobalScope</code>s for a given worklet type. For example, they might create them
-  during specific processes that call upon worklet code, as in the <a
-  href="#worklets-example-registering">example</a>. Or they might terminate them if the
+  <p>Additionally, user agents may, at any time, <span data-x="terminate a worklet global
+  scope">terminate</span> a given <code>WorkletGlobalScope</code>, unless the specification defining
+  the corresponding worklet type says otherwise. For example, they might terminate them if the
   <span>worklet agent</span>'s <span data-x="concept-agent-event-loop">event loop</span> has no
   <span data-x="concept-task">tasks</span> queued, or if the user agent has no pending operations
   planning to make use of the worklet, or if the user agent detects abnormal operations such as
   infinite loops or callbacks exceeding imposed time limits.</p>
 
+  <p>Finally, specifications for specific worklet types can give more specific details on when to
+  <span data-x="create a worklet global scope">create</span> <code>WorkletGlobalScope</code>s for a
+  given worklet type. For example, they might create them during specific processes that call upon
+  worklet code, as in the <a href="#worklets-example-registering">example</a>.</p>
 
   <h2 split-filename="webstorage" id="webstorage">Web storage</h2>