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core/src/main/resources/lib/hudson/progressBar.jelly

@@ -34,11 +34,15 @@ THE SOFTWARE.
     <st:attribute name="red">
       if set to non-null, the progress bar will be drawn in red, to indicate that the processing is likely stuck.
     </st:attribute>
+    <st:attribute name="id">
+      If set, id will be the identifier for the component
+    </st:attribute>
   </st:documentation>
 
   <x:element name="${attrs.href != null ? 'a' : 'div'}">
     <x:attribute name="class">jenkins-progress-bar ${attrs.red ? 'jenkins-progress-bar--error' : null}</x:attribute>
     <x:attribute name="href">${attrs.href}</x:attribute>
+    <x:attribute name="id">${attrs.id}</x:attribute>
 
     <j:choose>
       <j:when test="${pos lt 0}">

core/src/main/resources/lib/layout/progressiveRendering.jelly

@@ -36,7 +36,7 @@ THE SOFTWARE.
     </st:documentation>
     <st:adjunct includes="lib.layout.progressiveRendering.progressiveRendering"/>
     <j:set var="id" value="${h.generateId()}"/>
-    <t:progressBar id="${id}" pos="0" tooltip="${tooltip ?: '%progressMessage'}"/>
+    <t:progressBar id="${id}" pos="0" />
     <st:bind var="proxy" value="${handler}" />
     <div class="progressive-rendering-information-holder" data-id="${id}" data-callback="${callback}" />
 </j:jelly>