diff --git a/Packages/Fuziki_NSAttributedTextView/Package.swift b/Packages/Fuziki_NSAttributedTextView/Package.swift
index 5a574d6e..aea4a03a 100644
--- a/Packages/Fuziki_NSAttributedTextView/Package.swift
+++ b/Packages/Fuziki_NSAttributedTextView/Package.swift
@@ -22,5 +22,9 @@ let package = Package(
         .product(name: "CocoaExtension", package: "vChewing_CocoaExtension"),
       ]
     ),
+    .testTarget(
+      name: "NSAttributedTextViewTests",
+      dependencies: ["NSAttributedTextView"]
+    ),
   ]
 )
diff --git a/Packages/Fuziki_NSAttributedTextView/Sources/NSAttributedTextView/NSAttributedTextView.swift b/Packages/Fuziki_NSAttributedTextView/Sources/NSAttributedTextView/NSAttributedTextView.swift
index ae4030f5..f2fcaa40 100644
--- a/Packages/Fuziki_NSAttributedTextView/Sources/NSAttributedTextView/NSAttributedTextView.swift
+++ b/Packages/Fuziki_NSAttributedTextView/Sources/NSAttributedTextView/NSAttributedTextView.swift
@@ -72,6 +72,18 @@ public class NSAttributedTextView: NSView {
     }
   }
 
+  public init() {
+    super.init(frame: .zero)
+    #if compiler(>=5.9) && canImport(AppKit, _version: "14.0")
+      clipsToBounds = true // 得手動聲明該特性，否則該 View 的尺寸會失控。
+    #endif
+  }
+
+  @available(*, unavailable)
+  required init?(coder _: NSCoder) {
+    fatalError("init(coder:) has not been implemented")
+  }
+
   public func attributedStringValue(areaCalculation: Bool = false) -> NSAttributedString {
     var newAttributes = attributes
     let isVertical: Bool = !(direction == .horizontal)
@@ -131,8 +143,7 @@ public class NSAttributedTextView: NSView {
   }
 
   override public func draw(_ rect: CGRect) {
-    let context = NSGraphicsContext.current?.cgContext
-    guard let context = context else { return }
+    guard let currentNSGraphicsContext = NSGraphicsContext.current else { return }
     let setter = CTFramesetterCreateWithAttributedString(attributedStringValue())
     let path = CGPath(rect: rect, transform: nil)
     let theCTFrameProgression: CTFrameProgression = {
@@ -152,7 +163,16 @@ public class NSAttributedTextView: NSView {
     let bgPath: NSBezierPath = .init(roundedRect: rect, xRadius: 0, yRadius: 0)
     bgPath.fill()
     currentRect = rect
-    CTFrameDraw(newFrame, context)
+    if #unavailable(macOS 10.10) {
+      // 由於 NSGraphicsContext.current?.cgContext 僅對 macOS 10.10 Yosemite 開始的系統開放，
+      // 所以這裡必須直接從記憶體位置拿取原始資料來處理。
+      let contextPtr: Unmanaged<CGContext>? = Unmanaged.fromOpaque(currentNSGraphicsContext.graphicsPort)
+      let theContext: CGContext? = contextPtr?.takeUnretainedValue()
+      guard let theContext = theContext else { return }
+      CTFrameDraw(newFrame, theContext)
+    } else {
+      CTFrameDraw(newFrame, currentNSGraphicsContext.cgContext)
+    }
   }
 }
 
diff --git a/Packages/Fuziki_NSAttributedTextView/Tests/NSAttributedTextViewTests/NSAttributedTextViewTests.swift b/Packages/Fuziki_NSAttributedTextView/Tests/NSAttributedTextViewTests/NSAttributedTextViewTests.swift
new file mode 100644
index 00000000..013b2db7
--- /dev/null
+++ b/Packages/Fuziki_NSAttributedTextView/Tests/NSAttributedTextViewTests/NSAttributedTextViewTests.swift
@@ -0,0 +1,62 @@
+// (c) 2021 and onwards The vChewing Project (MIT-NTL License).
+// ====================
+// This code is released under the MIT license (SPDX-License-Identifier: MIT)
+// ... with NTL restriction stating that:
+// No trademark license is granted to use the trade names, trademarks, service
+// marks, or product names of Contributor, except as required to fulfill notice
+// requirements defined in MIT License.
+
+import AppKit
+import CocoaExtension
+import Foundation
+@testable import NSAttributedTextView
+import Shared
+import XCTest
+
+class MainAssemblyTests: XCTestCase {
+  func testView() throws {
+    let testCtl: testController = .init()
+    var rect = testCtl.attrView.shrinkFrame()
+    var bigRect = rect
+    bigRect.size.width += NSFont.systemFontSize
+    bigRect.size.height += NSFont.systemFontSize
+    rect.origin.x += ceil(NSFont.systemFontSize / 2)
+    rect.origin.y += ceil(NSFont.systemFontSize / 2)
+    testCtl.attrView.frame = rect
+    testCtl.window?.setFrame(bigRect, display: true)
+    testCtl.window?.orderFront(nil)
+    testCtl.attrView.draw(testCtl.attrView.frame)
+    testCtl.window?.setIsVisible(true)
+  }
+}
+
+class testController: NSWindowController {
+  var attrView: NSAttributedTextView
+  init() {
+    let contentRect = NSRect(x: 128.0, y: 128.0, width: 300.0, height: 20.0)
+    let styleMask: NSWindow.StyleMask = [.borderless, .nonactivatingPanel]
+    let panel = NSPanel(
+      contentRect: contentRect, styleMask: styleMask, backing: .buffered, defer: false
+    )
+    panel.level = NSWindow.Level(Int(max(CGShieldingWindowLevel(), kCGPopUpMenuWindowLevel)) + 2)
+    panel.hasShadow = true
+    panel.backgroundColor = NSColor.clear
+    panel.isOpaque = false
+    panel.isMovable = false
+    panel.contentView?.wantsLayer = true
+    panel.contentView?.layer?.cornerRadius = 7
+    panel.contentView?.layer?.backgroundColor = NSColor.controlBackgroundColor.cgColor
+    attrView = NSAttributedTextView()
+    attrView.backgroundColor = NSColor.clear
+    attrView.textColor = NSColor.textColor
+    attrView.needsDisplay = true
+    attrView.text = "114514"
+    panel.contentView?.addSubview(attrView)
+    super.init(window: panel)
+  }
+
+  @available(*, unavailable)
+  required init?(coder _: NSCoder) {
+    fatalError("init(coder:) has not been implemented")
+  }
+}