diff --git a/source b/source
index e9462d3f3c4..91683921dd0 100644
--- a/source
+++ b/source
@@ -12931,7 +12931,7 @@ interface <dfn>HTMLLinkElement</dfn> : <span>HTMLElement</span> {
   [<span>CEReactions</span>] attribute DOMString <span data-x="dom-link-referrerPolicy">referrerPolicy</span>;
   [<span>CEReactions</span>] attribute USVString <span data-x="dom-link-scope">scope</span>;
   [<span>CEReactions</span>] attribute <span>WorkerType</span> <span data-x="dom-link-workertype">workerType</span>;
-  [<span>CEReactions</span>] attribute <span>ServiceWorkerUpdateViaCache</span> updateViaCache;
+  [<span>CEReactions</span>] attribute DOMString <span data-x="dom-link-updateviacache">updateViaCache</span>;
 };
 <span>HTMLLinkElement</span> implements <span>LinkStyle</span>;</pre>
    </dd>
@@ -13138,14 +13138,13 @@ interface <dfn>HTMLLinkElement</dfn> : <span>HTMLElement</span> {
   specified on <code>link</code> elements that do not have a <code data-x="attr-link-rel">rel</code>
   attribute that contains the <code data-x="rel-serviceworker">serviceworker</code> keyword.</p>
 
-  <p>The <dfn><code data-x="attr-link-updateviacache">updateviacache</code></dfn> attribute is an
-  <span>enumerated attribute</span> that specifies the <span>update via cache mode</span> for a
-  <span>service worker registration</span>. The attribute's keywords are
-  "<code data-x="">imports</code>", "<code data-x="">all</code>", and "<code data-x="">never</code>,
-  which map to the respective states <i>imports</i>, <i>all</i>, and <i>never</i>. The <span>missing
-  value default</span> is the <i>imports</i> state. The attribute must not be specified on
-  <code>link</code> elements that do not have a <code data-x="attr-link-rel">rel</code> attribute
-  that contains the <code data-x="rel-serviceworker">serviceworker</code> keyword.</p>
+  <p>The <dfn><code data-x="attr-link-updateviacache">updateviacache</code></dfn> attribute
+  specifies the <span>update via cache mode</span> for a <span>service worker registration</span>.
+  It is an <span>enumerated attribute</span>. Each <span>update via cache mode</span> is a keyword
+  for this attribute, mapping to a state of the same name. The <span>missing value default</span> is
+  the <i>imports</i> state. The attribute must not be specified on <code>link</code> elements that
+  do not have a <code data-x="attr-link-rel">rel</code> attribute that contains the
+  <code data-x="rel-serviceworker">serviceworker</code> keyword.</p>
 
   <p>The <dfn><code data-x="attr-link-workertype">workertype</code></dfn> attribute is an
   <span>enumerated attribute</span> that specifies the <span>service worker type</span> for a
@@ -13211,7 +13210,7 @@ interface <dfn>HTMLLinkElement</dfn> : <span>HTMLElement</span> {
 
   <p>The <dfn><code data-x="dom-link-workerType">workerType</code></dfn> IDL attribute must
   <span>reflect</span> the <code data-x="attr-link-workertype">workertype</code> content
-  attribute.</p>
+  attribute, <span>limited to only known values</span>.</p>
 
   <h5>Processing the <code data-x="attr-link-media">media</code> attribute</h5>