diff --git a/modules/web/route.go b/modules/web/route.go
index 77c411a97b..787521dfb0 100644
--- a/modules/web/route.go
+++ b/modules/web/route.go
@@ -9,6 +9,7 @@ import (
 	"reflect"
 	"strings"
 
+	"code.gitea.io/gitea/modules/htmlutil"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/web/middleware"
 
@@ -214,7 +215,9 @@ func (r *Router) normalizeRequestPath(resp http.ResponseWriter, req *http.Reques
 			normalizedPath = "/"
 		} else if !strings.HasPrefix(normalizedPath+"/", "/v2/") {
 			// do not respond to other requests, to simulate a real sub-path environment
-			http.Error(resp, "404 page not found, sub-path is: "+setting.AppSubURL, http.StatusNotFound)
+			resp.Header().Add("Content-Type", "text/html; charset=utf-8")
+			resp.WriteHeader(http.StatusNotFound)
+			_, _ = resp.Write([]byte(htmlutil.HTMLFormat(`404 page not found, sub-path is: <a href="%s">%s</a>`, setting.AppSubURL, setting.AppSubURL)))
 			return
 		}
 		normalized = true
diff --git a/options/locale/locale_en-US.ini b/options/locale/locale_en-US.ini
index 8da7412ade..57d2d89c5a 100644
--- a/options/locale/locale_en-US.ini
+++ b/options/locale/locale_en-US.ini
@@ -2590,7 +2590,6 @@ diff.generated = generated
 diff.vendored = vendored
 diff.comment.add_line_comment = Add line comment
 diff.comment.placeholder = Leave a comment
-diff.comment.markdown_info = Styling with markdown is supported.
 diff.comment.add_single_comment = Add single comment
 diff.comment.add_review_comment = Add comment
 diff.comment.start_review = Start review
diff --git a/routers/web/web.go b/routers/web/web.go
index 5ed046a983..e89d069449 100644
--- a/routers/web/web.go
+++ b/routers/web/web.go
@@ -485,6 +485,8 @@ func registerRoutes(m *web.Router) {
 		m.Methods("GET, HEAD", "/*", public.FileHandlerFunc())
 	}, optionsCorsHandler())
 
+	m.Post("/-/markup", reqSignIn, web.Bind(structs.MarkupOption{}), misc.Markup)
+
 	m.Group("/explore", func() {
 		m.Get("", func(ctx *context.Context) {
 			ctx.Redirect(setting.AppSubURL + "/explore/repos")
diff --git a/templates/devtest/devtest-footer.tmpl b/templates/devtest/devtest-footer.tmpl
index 1c755508a5..a1b3b86e5c 100644
--- a/templates/devtest/devtest-footer.tmpl
+++ b/templates/devtest/devtest-footer.tmpl
@@ -1,3 +1,3 @@
 {{/* TODO: the devtest.js is isolated from index.js, so no module is shared and many index.js functions do not work in devtest.ts */}}
 <script src="{{AssetUrlPrefix}}/js/devtest.js?v={{AssetVersion}}"></script>
-{{template "base/footer" dict}}
+{{template "base/footer" ctx.RootData}}
diff --git a/templates/devtest/devtest-header.tmpl b/templates/devtest/devtest-header.tmpl
index a5910b96e6..ee08545640 100644
--- a/templates/devtest/devtest-header.tmpl
+++ b/templates/devtest/devtest-header.tmpl
@@ -1,2 +1,2 @@
-{{template "base/head" dict}}
+{{template "base/head" ctx.RootData}}
 <link rel="stylesheet" href="{{AssetUrlPrefix}}/css/devtest.css?v={{AssetVersion}}">
diff --git a/templates/devtest/gitea-ui.tmpl b/templates/devtest/gitea-ui.tmpl
index 303421fe13..5b40268761 100644
--- a/templates/devtest/gitea-ui.tmpl
+++ b/templates/devtest/gitea-ui.tmpl
@@ -183,8 +183,7 @@
 
 	<div>
 		<h1>ComboMarkdownEditor</h1>
-		<div>ps: no JS code attached, so just a layout</div>
-		{{template "shared/combomarkdowneditor" .}}
+		{{template "shared/combomarkdowneditor" dict "MarkdownPreviewContext" "/owner/path"}}
 	</div>
 
 	<h1>Tailwind CSS Demo</h1>
diff --git a/templates/org/settings/options.tmpl b/templates/org/settings/options.tmpl
index 62debfc0ae..3b817d068b 100644
--- a/templates/org/settings/options.tmpl
+++ b/templates/org/settings/options.tmpl
@@ -23,6 +23,7 @@
 							<input id="email" name="email" type="email" value="{{.Org.Email}}" maxlength="255">
 						</div>
 						<div class="field {{if .Err_Description}}error{{end}}">
+							{{/* it is rendered as markdown, but the length is limited, so at the moment we do not use the markdown editor here */}}
 							<label for="description">{{ctx.Locale.Tr "org.org_desc"}}</label>
 							<textarea id="description" name="description" rows="2" maxlength="255">{{.Org.Description}}</textarea>
 						</div>
diff --git a/templates/projects/new.tmpl b/templates/projects/new.tmpl
index bd173b54bc..a936079c46 100644
--- a/templates/projects/new.tmpl
+++ b/templates/projects/new.tmpl
@@ -18,7 +18,16 @@
 		</div>
 		<div class="field">
 			<label>{{ctx.Locale.Tr "repo.projects.description"}}</label>
-			<textarea name="content" placeholder="{{ctx.Locale.Tr "repo.projects.description_placeholder"}}">{{.content}}</textarea>
+			{{/* TODO: repo-level project and org-level project have different behaviros to render */}}
+			{{/* the "Repository" is nil when the project is org-level */}}
+			{{template "shared/combomarkdowneditor" (dict
+				"MarkdownPreviewInRepo" $.Repository
+				"MarkdownPreviewContext" (Iif $.Repository "" .HomeLink)
+				"MarkdownPreviewMode" (Iif $.Repository "comment")
+				"TextareaName" "content"
+				"TextareaContent" .content
+				"TextareaPlaceholder" (ctx.Locale.Tr "repo.projects.description_placeholder")
+			)}}
 		</div>
 
 		{{if not .PageIsEditProjects}}
diff --git a/templates/repo/diff/box.tmpl b/templates/repo/diff/box.tmpl
index 20e0c9db66..0f1458bfbf 100644
--- a/templates/repo/diff/box.tmpl
+++ b/templates/repo/diff/box.tmpl
@@ -240,8 +240,9 @@
 		<template id="issue-comment-editor-template">
 			<div class="ui form comment">
 				{{template "shared/combomarkdowneditor" (dict
-					"MarkdownPreviewUrl" (print $.Repository.Link "/markup")
-					"MarkdownPreviewContext" $.RepoLink
+					"CustomInit" true
+					"MarkdownPreviewInRepo" $.Repository
+					"MarkdownPreviewMode" "comment"
 					"TextareaName" "content"
 					"DropzoneParentContainer" ".ui.form"
 				)}}
diff --git a/templates/repo/diff/comment_form.tmpl b/templates/repo/diff/comment_form.tmpl
index 856b3da01a..964dc2adc7 100644
--- a/templates/repo/diff/comment_form.tmpl
+++ b/templates/repo/diff/comment_form.tmpl
@@ -9,24 +9,24 @@
 		<input type="hidden" name="diff_start_cid">
 		<input type="hidden" name="diff_end_cid">
 		<input type="hidden" name="diff_base_cid">
-
+		<div class="field">
 		{{template "shared/combomarkdowneditor" (dict
-			"MarkdownPreviewUrl" (print $.root.Repository.Link "/markup")
-			"MarkdownPreviewContext" $.root.RepoLink
+			"CustomInit" true
+			"MarkdownPreviewInRepo" $.root.Repository
+			"MarkdownPreviewMode" "comment"
 			"TextareaName" "content"
 			"TextareaPlaceholder" (ctx.Locale.Tr "repo.diff.comment.placeholder")
 			"DropzoneParentContainer" "form"
 			"DisableAutosize" "true"
 		)}}
-
+		</div>
 		{{if $.root.IsAttachmentEnabled}}
 			<div class="field">
 				{{template "repo/upload" $.root}}
 			</div>
 		{{end}}
 
-		<div class="field footer tw-mx-2">
-			<span class="markup-info">{{svg "octicon-markdown"}} {{ctx.Locale.Tr "repo.diff.comment.markdown_info"}}</span>
+		<div class="field footer">
 			<div class="tw-text-right">
 				{{if $.reply}}
 					<button class="ui submit primary tiny button btn-reply" type="submit">{{ctx.Locale.Tr "repo.diff.comment.reply"}}</button>
diff --git a/templates/repo/diff/new_review.tmpl b/templates/repo/diff/new_review.tmpl
index 1b74a230f4..2febc6303a 100644
--- a/templates/repo/diff/new_review.tmpl
+++ b/templates/repo/diff/new_review.tmpl
@@ -16,8 +16,8 @@
 				</div>
 				<div class="field">
 					{{template "shared/combomarkdowneditor" (dict
-						"MarkdownPreviewUrl" (print .Repository.Link "/markup")
-						"MarkdownPreviewContext" .RepoLink
+						"MarkdownPreviewInRepo" $.Repository
+						"MarkdownPreviewMode" "comment"
 						"TextareaName" "content"
 						"TextareaPlaceholder" (ctx.Locale.Tr "repo.diff.review.placeholder")
 						"DropzoneParentContainer" "form"
diff --git a/templates/repo/issue/comment_tab.tmpl b/templates/repo/issue/comment_tab.tmpl
index 4197ea4f65..a4626dd89e 100644
--- a/templates/repo/issue/comment_tab.tmpl
+++ b/templates/repo/issue/comment_tab.tmpl
@@ -5,11 +5,12 @@
 
 <div class="field">
 	{{template "shared/combomarkdowneditor" (dict
-		"MarkdownPreviewUrl" (print .Repository.Link "/markup")
-		"MarkdownPreviewContext" .RepoLink
+		"CustomInit" true
+		"MarkdownPreviewInRepo" $.Repository
+		"MarkdownPreviewMode" "comment"
 		"TextareaName" "content"
 		"TextareaContent" $textareaContent
-		"TextareaPlaceholder"  (ctx.Locale.Tr "repo.diff.comment.placeholder")
+		"TextareaPlaceholder" (ctx.Locale.Tr "repo.diff.comment.placeholder")
 		"DropzoneParentContainer" "form, .ui.form"
 	)}}
 </div>
diff --git a/templates/repo/issue/fields/textarea.tmpl b/templates/repo/issue/fields/textarea.tmpl
index 3ad69e1220..722b67015f 100644
--- a/templates/repo/issue/fields/textarea.tmpl
+++ b/templates/repo/issue/fields/textarea.tmpl
@@ -7,11 +7,12 @@
 
 	{{if $useMarkdownEditor}}
 		{{template "shared/combomarkdowneditor" (dict
+			"CustomInit" true
 			"ContainerClasses" "tw-hidden"
-			"MarkdownPreviewUrl" (print .root.RepoLink "/markup")
-			"MarkdownPreviewContext" .root.RepoLink
+			"MarkdownPreviewInRepo" $.root.Repository
+			"MarkdownPreviewMode" "comment"
 			"TextareaContent" .item.Attributes.value
-			"TextareaPlaceholder"  .item.Attributes.placeholder
+			"TextareaPlaceholder" .item.Attributes.placeholder
 			"DropzoneParentContainer" ".combo-editor-dropzone"
 		)}}
 
diff --git a/templates/repo/issue/milestone_new.tmpl b/templates/repo/issue/milestone_new.tmpl
index 96a3879b80..4809149a21 100644
--- a/templates/repo/issue/milestone_new.tmpl
+++ b/templates/repo/issue/milestone_new.tmpl
@@ -36,9 +36,14 @@
 				</div>
 				<div class="field">
 					<label>{{ctx.Locale.Tr "repo.milestones.desc"}}</label>
-					<textarea name="content">{{.content}}</textarea>
+					{{template "shared/combomarkdowneditor" (dict
+						"MarkdownPreviewInRepo" $.Repository
+						"MarkdownPreviewMode" "comment"
+						"TextareaName" "content"
+						"TextareaContent" .content
+						"TextareaPlaceholder" (ctx.Locale.Tr "repo.milestones.desc")
+					)}}
 				</div>
-				<div class="divider"></div>
 				<div class="tw-text-right">
 					{{if .PageIsEditMilestone}}
 						<a class="ui primary basic button" href="{{.RepoLink}}/milestones">
diff --git a/templates/repo/issue/view_content.tmpl b/templates/repo/issue/view_content.tmpl
index 3f7b2dc78f..69b5a11a14 100644
--- a/templates/repo/issue/view_content.tmpl
+++ b/templates/repo/issue/view_content.tmpl
@@ -142,8 +142,9 @@
 	<div class="ui form comment">
 		<div class="field">
 			{{template "shared/combomarkdowneditor" (dict
-				"MarkdownPreviewUrl" (print .Repository.Link "/markup")
-				"MarkdownPreviewContext" .RepoLink
+				"CustomInit" true
+				"MarkdownPreviewInRepo" $.Repository
+				"MarkdownPreviewMode" "comment"
 				"TextareaName" "content"
 				"DropzoneParentContainer" ".ui.form"
 			)}}
diff --git a/templates/repo/release/new.tmpl b/templates/repo/release/new.tmpl
index c01f9a421b..574b0d0311 100644
--- a/templates/repo/release/new.tmpl
+++ b/templates/repo/release/new.tmpl
@@ -50,12 +50,11 @@
 				</div>
 				<div class="field">
 					{{template "shared/combomarkdowneditor" (dict
-						"MarkdownPreviewUrl" (print .Repository.Link "/markup")
-						"MarkdownPreviewContext" .RepoLink
+						"MarkdownPreviewInRepo" $.Repository
+						"MarkdownPreviewMode" "comment"
 						"TextareaName" "content"
 						"TextareaContent" .content
 						"TextareaPlaceholder" (ctx.Locale.Tr "repo.release.message")
-						"TextareaAriaLabel" (ctx.Locale.Tr "repo.release.message")
 						"DropzoneParentContainer" "form"
 					)}}
 				</div>
diff --git a/templates/repo/wiki/new.tmpl b/templates/repo/wiki/new.tmpl
index 0f10e60c4f..ea2913c0fd 100644
--- a/templates/repo/wiki/new.tmpl
+++ b/templates/repo/wiki/new.tmpl
@@ -23,12 +23,12 @@
 				{{$content = ctx.Locale.Tr "repo.wiki.welcome"}}
 			{{end}}
 			{{template "shared/combomarkdowneditor" (dict
-				"MarkdownPreviewUrl" (print .Repository.Link "/markup")
-				"MarkdownPreviewContext" .RepoLink
+				"CustomInit" true
+				"MarkdownPreviewInRepo" $.Repository
+				"MarkdownPreviewMode" "wiki"
 				"TextareaName" "content"
-				"TextareaPlaceholder" (ctx.Locale.Tr "repo.wiki.page_content")
-				"TextareaAriaLabel" (ctx.Locale.Tr "repo.wiki.page_content")
 				"TextareaContent" $content
+				"TextareaPlaceholder" (ctx.Locale.Tr "repo.wiki.page_content")
 			)}}
 
 			<div class="field tw-mt-4">
diff --git a/templates/shared/combomarkdowneditor.tmpl b/templates/shared/combomarkdowneditor.tmpl
index 6ee989d1d6..3191346f59 100644
--- a/templates/shared/combomarkdowneditor.tmpl
+++ b/templates/shared/combomarkdowneditor.tmpl
@@ -1,23 +1,39 @@
 {{/*
 Template Attributes:
+* CustomInit: do not initialize the editor automatically
 * ContainerId: id attribute for the container element
 * ContainerClasses: additional classes for the container element
-* MarkdownPreviewUrl: preview url for the preview tab
-* MarkdownPreviewContext: preview context for the preview tab
+* MarkdownPreviewInRepo: the repo to preview markdown
+* MarkdownPreviewContext: preview context (the related url path when rendering) for the preview tab, eg: repo link or user home link
+* MarkdownPreviewMode: content mode for the editor, eg: wiki, comment or default
 * TextareaName: name attribute for the textarea
 * TextareaContent: content for the textarea
+* TextareaMaxLength: maxlength attribute for the textarea
 * TextareaPlaceholder: placeholder attribute for the textarea
 * TextareaAriaLabel: aria-label attribute for the textarea
 * DropzoneParentContainer: container for file upload (leave it empty if no upload)
 * DisableAutosize: whether to disable automatic height resizing
 */}}
-<div {{if .ContainerId}}id="{{.ContainerId}}"{{end}} class="combo-markdown-editor {{.ContainerClasses}}" data-dropzone-parent-container="{{.DropzoneParentContainer}}">
-	{{if .MarkdownPreviewUrl}}
+{{$ariaLabel := or .TextareaAriaLabel .TextareaPlaceholder}}
+{{$repo := .MarkdownPreviewInRepo}}
+{{$previewContext := .MarkdownPreviewContext}}
+{{$previewMode := .MarkdownPreviewMode}}
+{{$previewUrl := print AppSubUrl "/-/markup"}}
+{{if $repo}}
+	{{$previewUrl = print $repo.Link "/markup"}}
+{{end}}
+{{$supportEasyMDE := or (eq $previewMode "comment") (eq $previewMode "wiki")}}
+<div {{if .ContainerId}}id="{{.ContainerId}}"{{end}} class="combo-markdown-editor {{if .CustomInit}}custom-init{{end}} {{.ContainerClasses}}"
+		data-dropzone-parent-container="{{.DropzoneParentContainer}}"
+		data-content-mode="{{$previewMode}}"
+		data-support-easy-mde="{{$supportEasyMDE}}"
+		data-preview-url="{{$previewUrl}}"
+		data-preview-context="{{$previewContext}}"
+>
 	<div class="ui top tabular menu">
 		<a class="active item" data-tab-for="markdown-writer">{{template "shared/misc/tabtitle" (ctx.Locale.Tr "write")}}</a>
-		<a class="item" data-tab-for="markdown-previewer" data-preview-url="{{.MarkdownPreviewUrl}}" data-preview-context="{{.MarkdownPreviewContext}}">{{template "shared/misc/tabtitle" (ctx.Locale.Tr "preview")}}</a>
+		<a class="item" data-tab-for="markdown-previewer">{{template "shared/misc/tabtitle" (ctx.Locale.Tr "preview")}}</a>
 	</div>
-	{{end}}
 	<div class="ui tab active" data-tab-panel="markdown-writer">
 		<markdown-toolbar>
 			<div class="markdown-toolbar-group">
@@ -40,17 +56,25 @@ Template Attributes:
 				<md-task-list class="markdown-toolbar-button" data-tooltip-content="{{ctx.Locale.Tr "editor.buttons.list.task.tooltip"}}">{{svg "octicon-tasklist"}}</md-task-list>
 				<button class="markdown-toolbar-button markdown-button-table-add" data-tooltip-content="{{ctx.Locale.Tr "editor.buttons.table.add.tooltip"}}">{{svg "octicon-table"}}</button>
 			</div>
+			{{if eq $previewMode "comment"}}
 			<div class="markdown-toolbar-group">
 				<md-mention class="markdown-toolbar-button" data-tooltip-content="{{ctx.Locale.Tr "editor.buttons.mention.tooltip"}}">{{svg "octicon-mention"}}</md-mention>
 				<md-ref class="markdown-toolbar-button" data-tooltip-content="{{ctx.Locale.Tr "editor.buttons.ref.tooltip"}}">{{svg "octicon-cross-reference"}}</md-ref>
 			</div>
+			{{end}}
 			<div class="markdown-toolbar-group">
 				<button class="markdown-toolbar-button markdown-switch-monospace" role="switch" data-enable-text="{{ctx.Locale.Tr "editor.buttons.enable_monospace_font"}}" data-disable-text="{{ctx.Locale.Tr "editor.buttons.disable_monospace_font"}}">{{svg "octicon-typography"}}</button>
+				{{if $supportEasyMDE}}
 				<button class="markdown-toolbar-button markdown-switch-easymde" data-tooltip-content="{{ctx.Locale.Tr "editor.buttons.switch_to_legacy.tooltip"}}">{{svg "octicon-arrow-switch"}}</button>
+				{{end}}
 			</div>
 		</markdown-toolbar>
 		<text-expander keys=": @ #" multiword="#" suffix="">
-			<textarea class="markdown-text-editor"{{if .TextareaName}} name="{{.TextareaName}}"{{end}}{{if .TextareaPlaceholder}} placeholder="{{.TextareaPlaceholder}}"{{end}}{{if .TextareaAriaLabel}} aria-label="{{.TextareaAriaLabel}}"{{end}}{{if .DisableAutosize}} data-disable-autosize="{{.DisableAutosize}}"{{end}}>{{.TextareaContent}}</textarea>
+			<textarea class="markdown-text-editor"
+				{{if .TextareaName}}name="{{.TextareaName}}"{{end}} {{if .TextareaMaxLength}}maxlength="{{.TextareaMaxLength}}"{{end}}
+				{{if .TextareaPlaceholder}}placeholder="{{.TextareaPlaceholder}}"{{end}} {{if $ariaLabel}}aria-label="{{$ariaLabel}}"{{end}}
+				{{if .DisableAutosize}}data-disable-autosize="{{.DisableAutosize}}"{{end}}
+			>{{.TextareaContent}}</textarea>
 		</text-expander>
 		<script>
 			if (localStorage?.getItem('markdown-editor-monospace') === 'true') {
diff --git a/templates/user/settings/profile.tmpl b/templates/user/settings/profile.tmpl
index f879587c71..197763425c 100644
--- a/templates/user/settings/profile.tmpl
+++ b/templates/user/settings/profile.tmpl
@@ -29,6 +29,7 @@
 					<p id="signed-user-email">{{.SignedUser.Email}}</p>
 				</div>
 				<div class="field {{if .Err_Description}}error{{end}}">
+					{{/* it is rendered as markdown, but the length is limited, so at the moment we do not use the markdown editor here */}}
 					<label for="description">{{ctx.Locale.Tr "user.user_bio"}}</label>
 					<textarea id="description" name="description" rows="2" placeholder="{{ctx.Locale.Tr "settings.biography_placeholder"}}" maxlength="255">{{.SignedUser.Description}}</textarea>
 				</div>
diff --git a/web_src/css/editor/combomarkdowneditor.css b/web_src/css/editor/combomarkdowneditor.css
index 97a8b70227..835286b795 100644
--- a/web_src/css/editor/combomarkdowneditor.css
+++ b/web_src/css/editor/combomarkdowneditor.css
@@ -96,6 +96,11 @@
   font-size: 0.85em;
 }
 
+.combo-markdown-editor .ui.tab.markup[data-tab-panel="markdown-previewer"] {
+  border-bottom: 1px solid var(--color-secondary);
+  padding-bottom: 1rem;
+}
+
 text-expander {
   display: block;
   position: relative;
diff --git a/web_src/css/repo.css b/web_src/css/repo.css
index 12cdc4657b..b40859975c 100644
--- a/web_src/css/repo.css
+++ b/web_src/css/repo.css
@@ -1005,7 +1005,7 @@ td .commit-summary {
 }
 
 .repository.view.issue .comment-list .code-comment .comment-content {
-  margin-left: 36px;
+  margin-left: 24px;
 }
 
 .repository.view.issue .comment-list .comment > .avatar {
diff --git a/web_src/css/review.css b/web_src/css/review.css
index 0d69e36681..036ad017f8 100644
--- a/web_src/css/review.css
+++ b/web_src/css/review.css
@@ -102,19 +102,11 @@
   cursor: pointer;
 }
 
-.comment-code-cloud .ui.active.tab {
-  padding: 0.5em;
-}
-
 .comment-code-cloud .ui.active.tab.markup {
   padding: 1em;
   min-height: 168px;
 }
 
-.comment-code-cloud .ui.tabular.menu {
-  margin: 0.5em;
-}
-
 .comment-code-cloud .editor-statusbar {
   display: none;
 }
@@ -123,23 +115,6 @@
   padding: 10px 0;
 }
 
-.comment-code-cloud .footer .markup-info {
-  display: inline-block;
-  margin: 5px 0;
-  font-size: 12px;
-  color: var(--color-text-light);
-}
-
-.comment-code-cloud .footer .ui.right.floated {
-  padding-top: 6px;
-}
-
-.comment-code-cloud .footer::after {
-  clear: both;
-  content: "";
-  display: block;
-}
-
 .diff-file-body .comment-form {
   margin: 0 0 0 3em;
 }
diff --git a/web_src/js/features/common-form.ts b/web_src/js/features/common-form.ts
index 1aca93169d..86323e352e 100644
--- a/web_src/js/features/common-form.ts
+++ b/web_src/js/features/common-form.ts
@@ -1,5 +1,7 @@
 import {applyAreYouSure, initAreYouSure} from '../vendor/jquery.are-you-sure.ts';
 import {handleGlobalEnterQuickSubmit} from './comp/QuickSubmit.ts';
+import {queryElems} from '../utils/dom.ts';
+import {initComboMarkdownEditor} from './comp/ComboMarkdownEditor.ts';
 
 export function initGlobalFormDirtyLeaveConfirm() {
   initAreYouSure(window.jQuery);
@@ -11,7 +13,7 @@ export function initGlobalFormDirtyLeaveConfirm() {
 }
 
 export function initGlobalEnterQuickSubmit() {
-  document.addEventListener('keydown', (e) => {
+  document.addEventListener('keydown', (e: KeyboardEvent & {target: HTMLElement}) => {
     if (e.key !== 'Enter') return;
     const hasCtrlOrMeta = ((e.ctrlKey || e.metaKey) && !e.altKey);
     if (hasCtrlOrMeta && e.target.matches('textarea')) {
@@ -27,3 +29,7 @@ export function initGlobalEnterQuickSubmit() {
     }
   });
 }
+
+export function initGlobalComboMarkdownEditor() {
+  queryElems<HTMLElement>(document, '.combo-markdown-editor:not(.custom-init)', (el) => initComboMarkdownEditor(el));
+}
diff --git a/web_src/js/features/comp/ComboMarkdownEditor.ts b/web_src/js/features/comp/ComboMarkdownEditor.ts
index 7117952fa3..80eabaa37a 100644
--- a/web_src/js/features/comp/ComboMarkdownEditor.ts
+++ b/web_src/js/features/comp/ComboMarkdownEditor.ts
@@ -1,6 +1,5 @@
 import '@github/markdown-toolbar-element';
 import '@github/text-expander-element';
-import $ from 'jquery';
 import {attachTribute} from '../tribute.ts';
 import {hideElem, showElem, autosize, isElemVisible} from '../../utils/dom.ts';
 import {
@@ -23,6 +22,8 @@ import {
 } from './EditorMarkdown.ts';
 import {DropzoneCustomEventReloadFiles, initDropzone} from '../dropzone.ts';
 import {createTippy} from '../../modules/tippy.ts';
+import {fomanticQuery} from '../../modules/fomantic/base.ts';
+import type EasyMDE from 'easymde';
 
 let elementIdCounter = 0;
 
@@ -48,18 +49,23 @@ export function validateTextareaNonEmpty(textarea) {
   return true;
 }
 
+type ComboMarkdownEditorOptions = {
+  editorHeights?: {minHeight?: string, height?: string, maxHeight?: string},
+  easyMDEOptions?: EasyMDE.Options,
+};
+
 export class ComboMarkdownEditor {
   static EventEditorContentChanged = EventEditorContentChanged;
   static EventUploadStateChanged = EventUploadStateChanged;
 
   public container : HTMLElement;
 
-  // TODO: use correct types to replace these "any" types
-  options: any;
+  options: ComboMarkdownEditorOptions;
 
   tabEditor: HTMLElement;
   tabPreviewer: HTMLElement;
 
+  supportEasyMDE: boolean;
   easyMDE: any;
   easyMDEToolbarActions: any;
   easyMDEToolbarDefault: any;
@@ -71,11 +77,12 @@ export class ComboMarkdownEditor {
   dropzone: HTMLElement;
   attachedDropzoneInst: any;
 
+  previewMode: string;
   previewUrl: string;
   previewContext: string;
-  previewMode: string;
 
-  constructor(container, options = {}) {
+  constructor(container, options:ComboMarkdownEditorOptions = {}) {
+    if (container._giteaComboMarkdownEditor) throw new Error('ComboMarkdownEditor already initialized');
     container._giteaComboMarkdownEditor = this;
     this.options = options;
     this.container = container;
@@ -99,6 +106,10 @@ export class ComboMarkdownEditor {
   }
 
   setupContainer() {
+    this.supportEasyMDE = this.container.getAttribute('data-support-easy-mde') === 'true';
+    this.previewMode = this.container.getAttribute('data-content-mode');
+    this.previewUrl = this.container.getAttribute('data-preview-url');
+    this.previewContext = this.container.getAttribute('data-preview-context');
     initTextExpander(this.container.querySelector('text-expander'));
   }
 
@@ -137,12 +148,14 @@ export class ComboMarkdownEditor {
       monospaceButton.setAttribute('aria-checked', String(enabled));
     });
 
-    const easymdeButton = this.container.querySelector('.markdown-switch-easymde');
-    easymdeButton.addEventListener('click', async (e) => {
-      e.preventDefault();
-      this.userPreferredEditor = 'easymde';
-      await this.switchToEasyMDE();
-    });
+    if (this.supportEasyMDE) {
+      const easymdeButton = this.container.querySelector('.markdown-switch-easymde');
+      easymdeButton.addEventListener('click', async (e) => {
+        e.preventDefault();
+        this.userPreferredEditor = 'easymde';
+        await this.switchToEasyMDE();
+      });
+    }
 
     this.initMarkdownButtonTableAdd();
 
@@ -187,6 +200,7 @@ export class ComboMarkdownEditor {
 
   setupTab() {
     const tabs = this.container.querySelectorAll<HTMLElement>('.tabular.menu > .item');
+    if (!tabs.length) return;
 
     // Fomantic Tab requires the "data-tab" to be globally unique.
     // So here it uses our defined "data-tab-for" and "data-tab-panel" to generate the "data-tab" attribute for Fomantic.
@@ -207,11 +221,8 @@ export class ComboMarkdownEditor {
       });
     });
 
-    $(tabs).tab();
+    fomanticQuery(tabs).tab();
 
-    this.previewUrl = this.tabPreviewer.getAttribute('data-preview-url');
-    this.previewContext = this.tabPreviewer.getAttribute('data-preview-context');
-    this.previewMode = this.options.previewMode ?? 'comment';
     this.tabPreviewer.addEventListener('click', async () => {
       const formData = new FormData();
       formData.append('mode', this.previewMode);
@@ -219,7 +230,7 @@ export class ComboMarkdownEditor {
       formData.append('text', this.value());
       const response = await POST(this.previewUrl, {data: formData});
       const data = await response.text();
-      renderPreviewPanelContent($(panelPreviewer), data);
+      renderPreviewPanelContent(panelPreviewer, data);
     });
   }
 
@@ -284,7 +295,7 @@ export class ComboMarkdownEditor {
   }
 
   async switchToUserPreference() {
-    if (this.userPreferredEditor === 'easymde') {
+    if (this.userPreferredEditor === 'easymde' && this.supportEasyMDE) {
       await this.switchToEasyMDE();
     } else {
       this.switchToTextarea();
@@ -304,7 +315,7 @@ export class ComboMarkdownEditor {
     if (this.easyMDE) return;
     // EasyMDE's CSS should be loaded via webpack config, otherwise our own styles can not overwrite the default styles.
     const {default: EasyMDE} = await import(/* webpackChunkName: "easymde" */'easymde');
-    const easyMDEOpt = {
+    const easyMDEOpt: EasyMDE.Options = {
       autoDownloadFontAwesome: false,
       element: this.textarea,
       forceSync: true,
@@ -384,19 +395,20 @@ export class ComboMarkdownEditor {
   }
 
   get userPreferredEditor() {
-    return window.localStorage.getItem(`markdown-editor-${this.options.useScene ?? 'default'}`);
+    return window.localStorage.getItem(`markdown-editor-${this.previewMode ?? 'default'}`);
   }
   set userPreferredEditor(s) {
-    window.localStorage.setItem(`markdown-editor-${this.options.useScene ?? 'default'}`, s);
+    window.localStorage.setItem(`markdown-editor-${this.previewMode ?? 'default'}`, s);
   }
 }
 
 export function getComboMarkdownEditor(el) {
-  if (el instanceof $) el = el[0];
-  return el?._giteaComboMarkdownEditor;
+  if (!el) return null;
+  if (el.length) el = el[0];
+  return el._giteaComboMarkdownEditor;
 }
 
-export async function initComboMarkdownEditor(container: HTMLElement, options = {}) {
+export async function initComboMarkdownEditor(container: HTMLElement, options:ComboMarkdownEditorOptions = {}) {
   if (!container) {
     throw new Error('initComboMarkdownEditor: container is null');
   }
diff --git a/web_src/js/features/repo-editor.ts b/web_src/js/features/repo-editor.ts
index 6ea9347eba..adae55f25c 100644
--- a/web_src/js/features/repo-editor.ts
+++ b/web_src/js/features/repo-editor.ts
@@ -201,10 +201,8 @@ export function initRepoEditor() {
   })();
 }
 
-export function renderPreviewPanelContent($previewPanel, data) {
-  $previewPanel.html(data);
+export function renderPreviewPanelContent(previewPanel: Element, content: string) {
+  previewPanel.innerHTML = content;
   initMarkupContent();
-
-  const $refIssues = $previewPanel.find('p .ref-issue');
-  attachRefIssueContextPopup($refIssues);
+  attachRefIssueContextPopup(previewPanel.querySelectorAll('p .ref-issue'));
 }
diff --git a/web_src/js/features/repo-issue.ts b/web_src/js/features/repo-issue.ts
index 9cc478712b..a59e4319ab 100644
--- a/web_src/js/features/repo-issue.ts
+++ b/web_src/js/features/repo-issue.ts
@@ -414,11 +414,6 @@ export function initRepoPullRequestReview() {
     await handleReply(this);
   });
 
-  const elReviewBox = document.querySelector('.review-box-panel');
-  if (elReviewBox) {
-    initComboMarkdownEditor(elReviewBox.querySelector('.combo-markdown-editor'));
-  }
-
   // The following part is only for diff views
   if (!$('.repository.pull.diff').length) return;
 
diff --git a/web_src/js/features/repo-release.ts b/web_src/js/features/repo-release.ts
index 7589c77136..c59ab1f323 100644
--- a/web_src/js/features/repo-release.ts
+++ b/web_src/js/features/repo-release.ts
@@ -1,5 +1,4 @@
 import {hideElem, showElem} from '../utils/dom.ts';
-import {initComboMarkdownEditor} from './comp/ComboMarkdownEditor.ts';
 
 export function initRepoRelease() {
   document.addEventListener('click', (e) => {
@@ -16,7 +15,6 @@ export function initRepoReleaseNew() {
   if (!document.querySelector('.repository.new.release')) return;
 
   initTagNameEditor();
-  initRepoReleaseEditor();
 }
 
 function initTagNameEditor() {
@@ -48,11 +46,3 @@ function initTagNameEditor() {
     hideTargetInput(e.target);
   });
 }
-
-function initRepoReleaseEditor() {
-  const editor = document.querySelector<HTMLElement>('.repository.new.release .combo-markdown-editor');
-  if (!editor) {
-    return;
-  }
-  initComboMarkdownEditor(editor);
-}
diff --git a/web_src/js/features/repo-wiki.ts b/web_src/js/features/repo-wiki.ts
index 0e72b87109..69188d6ae2 100644
--- a/web_src/js/features/repo-wiki.ts
+++ b/web_src/js/features/repo-wiki.ts
@@ -2,6 +2,7 @@ import {initMarkupContent} from '../markup/content.ts';
 import {validateTextareaNonEmpty, initComboMarkdownEditor} from './comp/ComboMarkdownEditor.ts';
 import {fomanticMobileScreen} from '../modules/fomantic.ts';
 import {POST} from '../modules/fetch.ts';
+import type {ComboMarkdownEditor} from './comp/ComboMarkdownEditor.ts';
 
 async function initRepoWikiFormEditor() {
   const editArea = document.querySelector<HTMLTextAreaElement>('.repository.wiki .combo-markdown-editor textarea');
@@ -9,7 +10,7 @@ async function initRepoWikiFormEditor() {
 
   const form = document.querySelector('.repository.wiki.new .ui.form');
   const editorContainer = form.querySelector<HTMLElement>('.combo-markdown-editor');
-  let editor;
+  let editor: ComboMarkdownEditor;
 
   let renderRequesting = false;
   let lastContent;
@@ -45,12 +46,10 @@ async function initRepoWikiFormEditor() {
   renderEasyMDEPreview();
 
   editor = await initComboMarkdownEditor(editorContainer, {
-    useScene: 'wiki',
     // EasyMDE has some problems of height definition, it has inline style height 300px by default, so we also use inline styles to override it.
     // And another benefit is that we only need to write the style once for both editors.
     // TODO: Move height style to CSS after EasyMDE removal.
     editorHeights: {minHeight: '300px', height: 'calc(100vh - 600px)'},
-    previewMode: 'wiki',
     easyMDEOptions: {
       previewRender: (_content, previewTarget) => previewTarget.innerHTML, // disable builtin preview render
       toolbar: ['bold', 'italic', 'strikethrough', '|',
@@ -59,7 +58,7 @@ async function initRepoWikiFormEditor() {
         'unordered-list', 'ordered-list', '|',
         'link', 'image', 'table', 'horizontal-rule', '|',
         'preview', 'fullscreen', 'side-by-side', '|', 'gitea-switch-to-textarea',
-      ],
+      ] as any, // to use custom toolbar buttons
     },
   });
 
diff --git a/web_src/js/index.ts b/web_src/js/index.ts
index 90e2d29225..48c4b76cee 100644
--- a/web_src/js/index.ts
+++ b/web_src/js/index.ts
@@ -83,7 +83,11 @@ import {
   initGlobalButtons,
   initGlobalDeleteButton,
 } from './features/common-button.ts';
-import {initGlobalEnterQuickSubmit, initGlobalFormDirtyLeaveConfirm} from './features/common-form.ts';
+import {
+  initGlobalComboMarkdownEditor,
+  initGlobalEnterQuickSubmit,
+  initGlobalFormDirtyLeaveConfirm,
+} from './features/common-form.ts';
 
 initGiteaFomantic();
 initDirAuto();
@@ -127,6 +131,7 @@ onDomReady(() => {
     initGlobalCopyToClipboardListener,
     initGlobalEnterQuickSubmit,
     initGlobalFormDirtyLeaveConfirm,
+    initGlobalComboMarkdownEditor,
     initGlobalDeleteButton,
 
     initCommonOrganization,