diff --git a/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/Navigation.java b/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/Navigation.java
index 032cc9c40f7..a3456127598 100644
--- a/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/Navigation.java
+++ b/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/Navigation.java
@@ -480,8 +480,7 @@ public class Navigation {
         var inputText = HtmlTree.INPUT(HtmlAttr.InputType.TEXT, HtmlIds.SEARCH_INPUT)
                 .put(HtmlAttr.PLACEHOLDER, resources.getText("doclet.search_placeholder"))
                 .put(HtmlAttr.ARIA_LABEL, resources.getText("doclet.search_in_documentation"))
-                .put(HtmlAttr.AUTOCOMPLETE, "off")
-                .put(HtmlAttr.AUTOCAPITALIZE, "off");
+                .put(HtmlAttr.AUTOCOMPLETE, "off");
         var inputReset = HtmlTree.INPUT(HtmlAttr.InputType.RESET, HtmlIds.RESET_SEARCH)
                 .put(HtmlAttr.VALUE, resources.getText("doclet.search_reset"));
         var searchDiv = HtmlTree.DIV(HtmlStyle.navListSearch)
diff --git a/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/SearchWriter.java b/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/SearchWriter.java
index feee351870b..8a2f0e29109 100644
--- a/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/SearchWriter.java
+++ b/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/SearchWriter.java
@@ -84,8 +84,7 @@ public class SearchWriter extends HtmlDocletWriter {
                 .add(HtmlTree.DIV(HtmlTree.INPUT(HtmlAttr.InputType.TEXT, HtmlId.of("page-search-input"))
                                 .put(HtmlAttr.PLACEHOLDER, resources.getText("doclet.search_placeholder"))
                                 .put(HtmlAttr.ARIA_LABEL, resources.getText("doclet.search_in_documentation"))
-                                .put(HtmlAttr.AUTOCOMPLETE, "off")
-                                .put(HtmlAttr.AUTOCAPITALIZE, "off"))
+                                .put(HtmlAttr.AUTOCOMPLETE, "off"))
                         .add(HtmlTree.INPUT(HtmlAttr.InputType.RESET, HtmlId.of("page-search-reset"))
                                 .put(HtmlAttr.VALUE, resources.getText("doclet.search_reset"))
                                 .put(HtmlAttr.STYLE, "margin: 6px;"))
diff --git a/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/TableOfContents.java b/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/TableOfContents.java
index 8d478f8fa02..7cfbffb6cee 100644
--- a/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/TableOfContents.java
+++ b/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/TableOfContents.java
@@ -95,8 +95,7 @@ public class TableOfContents {
                     .add(HtmlTree.INPUT(HtmlAttr.InputType.TEXT, HtmlStyle.filterInput)
                             .put(HtmlAttr.PLACEHOLDER, writer.resources.getText("doclet.filter_label"))
                             .put(HtmlAttr.ARIA_LABEL, writer.resources.getText("doclet.filter_table_of_contents"))
-                            .put(HtmlAttr.AUTOCOMPLETE, "off")
-                            .put(HtmlAttr.AUTOCAPITALIZE, "off"))
+                            .put(HtmlAttr.AUTOCOMPLETE, "off"))
                     .add(HtmlTree.INPUT(HtmlAttr.InputType.RESET, HtmlStyle.resetFilter)
                             .put(HtmlAttr.VALUE, writer.resources.getText("doclet.filter_reset")));
         }
diff --git a/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/markup/HtmlAttr.java b/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/markup/HtmlAttr.java
index 8fe06640907..1d0d54a0525 100644
--- a/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/markup/HtmlAttr.java
+++ b/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/markup/HtmlAttr.java
@@ -39,7 +39,6 @@ public enum HtmlAttr {
     ARIA_ORIENTATION("aria-orientation"),
     ARIA_SELECTED("aria-selected"),
     AUTOCOMPLETE,
-    AUTOCAPITALIZE,
     CHECKED,
     CLASS,
     CLEAR,
diff --git a/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/resources/script.js.template b/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/resources/script.js.template
index e08ff5db68c..e14a2ef34cb 100644
--- a/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/resources/script.js.template
+++ b/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/resources/script.js.template
@@ -246,6 +246,7 @@ document.addEventListener("DOMContentLoaded", function(e) {
     }
     document.querySelectorAll("input.filter-input").forEach(function(input) {
         input.removeAttribute("disabled");
+        input.setAttribute("autocapitalize", "off");
         input.value = "";
         input.addEventListener("input", function(e) {
             const pattern = input.value ? input.value.trim()
diff --git a/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/resources/search-page.js b/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/resources/search-page.js
index 5b5b4659acd..bcbd9b59f31 100644
--- a/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/resources/search-page.js
+++ b/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/resources/search-page.js
@@ -244,6 +244,7 @@ $(window).on("load", function() {
         setSearchUrl();
     });
     input.prop("disabled", false);
+    input.attr("autocapitalize", "off");
     reset.prop("disabled", false);
 
     var urlParams = new URLSearchParams(window.location.search);
@@ -263,4 +264,4 @@ $(window).on("load", function() {
         notify.html(messages.enterTerm);
     }
     input.select().focus();
-});
\ No newline at end of file
+});
diff --git a/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/resources/search.js.template b/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/resources/search.js.template
index debdeb38d58..c82964fa685 100644
--- a/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/resources/search.js.template
+++ b/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/resources/search.js.template
@@ -426,6 +426,7 @@ $(function() {
     });
     search.val('');
     search.prop("disabled", false);
+    search.attr("autocapitalize", "off");
     reset.prop("disabled", false);
     reset.click(function() {
         search.val('').focus();
diff --git a/test/langtools/jdk/javadoc/doclet/testSearch/TestSearch.java b/test/langtools/jdk/javadoc/doclet/testSearch/TestSearch.java
index 1201eb52160..a7f1ad91ced 100644
--- a/test/langtools/jdk/javadoc/doclet/testSearch/TestSearch.java
+++ b/test/langtools/jdk/javadoc/doclet/testSearch/TestSearch.java
@@ -434,7 +434,7 @@ public class TestSearch extends JavadocTester {
                 """
                     <div class="nav-list-search">
                     <input type="text" id="search-input" disabled placeholder="Search" aria-label="S\
-                    earch in documentation" autocomplete="off" autocapitalize="off">
+                    earch in documentation" autocomplete="off">
                     <input type="reset" id="reset-search" disabled value="Reset">
                     </div>""");
     }
diff --git a/test/langtools/jdk/javadoc/doclet/testSpecTag/TestSpecTag.java b/test/langtools/jdk/javadoc/doclet/testSpecTag/TestSpecTag.java
index 095e8b4a344..265dfcb8600 100644
--- a/test/langtools/jdk/javadoc/doclet/testSpecTag/TestSpecTag.java
+++ b/test/langtools/jdk/javadoc/doclet/testSpecTag/TestSpecTag.java
@@ -134,7 +134,7 @@ public class TestSpecTag extends JavadocTester {
                     <ol class="sub-nav-list"></ol>
                     <div class="nav-list-search">
                     <input type="text" id="search-input" disabled placeholder="Search" aria-label="S\
-                    earch in documentation" autocomplete="off" autocapitalize="off">
+                    earch in documentation" autocomplete="off">
                     <input type="reset" id="reset-search" disabled value="Reset">
                     </div>
                     </div>