diff --git a/Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.cpp
index 67bcd99e67..0969ca77ff 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.cpp
@@ -153,7 +153,7 @@ JS::ThrowCompletionOr<HTMLCanvasElement::HasOrCreatedContext> HTMLCanvasElement:
 }
 
 // https://html.spec.whatwg.org/multipage/canvas.html#dom-canvas-getcontext
-JS::ThrowCompletionOr<HTMLCanvasElement::RenderingContext> HTMLCanvasElement::get_context(DeprecatedString const& type, JS::Value options)
+JS::ThrowCompletionOr<HTMLCanvasElement::RenderingContext> HTMLCanvasElement::get_context(String const& type, JS::Value options)
 {
     // 1. If options is not an object, then set options to null.
     if (!options.is_object())
@@ -246,14 +246,14 @@ static ErrorOr<SerializeBitmapResult> serialize_bitmap(Gfx::Bitmap const& bitmap
 }
 
 // https://html.spec.whatwg.org/multipage/canvas.html#dom-canvas-todataurl
-DeprecatedString HTMLCanvasElement::to_data_url(DeprecatedString const& type, Optional<double> quality) const
+String HTMLCanvasElement::to_data_url(StringView type, Optional<double> quality) const
 {
     // FIXME: 1. If this canvas element's bitmap's origin-clean flag is set to false, then throw a "SecurityError" DOMException.
 
     // 2. If this canvas element's bitmap has no pixels (i.e. either its horizontal dimension or its vertical dimension is zero)
     //    then return the string "data:,". (This is the shortest data: URL; it represents the empty string in a text/plain resource.)
     if (!m_bitmap)
-        return "data:,";
+        return "data:,"_string;
 
     // 3. Let file be a serialization of this canvas element's bitmap as a file, passing type and quality if given.
     auto file = serialize_bitmap(*m_bitmap, type, move(quality));
@@ -261,19 +261,19 @@ DeprecatedString HTMLCanvasElement::to_data_url(DeprecatedString const& type, Op
     // 4. If file is null then return "data:,".
     if (file.is_error()) {
         dbgln("HTMLCanvasElement: Failed to encode canvas bitmap to {}: {}", type, file.error());
-        return "data:,";
+        return "data:,"_string;
     }
 
     // 5. Return a data: URL representing file. [RFC2397]
     auto base64_encoded_or_error = encode_base64(file.value().buffer);
     if (base64_encoded_or_error.is_error()) {
-        return "data:,";
+        return "data:,"_string;
     }
-    return AK::URL::create_with_data(file.value().mime_type, base64_encoded_or_error.release_value(), true).to_deprecated_string();
+    return MUST(AK::URL::create_with_data(file.value().mime_type, base64_encoded_or_error.release_value(), true).to_string());
 }
 
 // https://html.spec.whatwg.org/multipage/canvas.html#dom-canvas-toblob
-WebIDL::ExceptionOr<void> HTMLCanvasElement::to_blob(JS::NonnullGCPtr<WebIDL::CallbackType> callback, DeprecatedString const& type, Optional<double> quality)
+WebIDL::ExceptionOr<void> HTMLCanvasElement::to_blob(JS::NonnullGCPtr<WebIDL::CallbackType> callback, StringView type, Optional<double> quality)
 {
     // FIXME: 1. If this canvas element's bitmap's origin-clean flag is set to false, then throw a "SecurityError" DOMException.
 
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.h b/Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.h
index c8f26c7e31..79d798f13a 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.h
@@ -25,7 +25,7 @@ public:
     Gfx::Bitmap* bitmap() { return m_bitmap; }
     bool create_bitmap(size_t minimum_width = 0, size_t minimum_height = 0);
 
-    JS::ThrowCompletionOr<RenderingContext> get_context(DeprecatedString const& type, JS::Value options);
+    JS::ThrowCompletionOr<RenderingContext> get_context(String const& type, JS::Value options);
 
     unsigned width() const;
     unsigned height() const;
@@ -33,8 +33,8 @@ public:
     WebIDL::ExceptionOr<void> set_width(unsigned);
     WebIDL::ExceptionOr<void> set_height(unsigned);
 
-    DeprecatedString to_data_url(DeprecatedString const& type, Optional<double> quality) const;
-    WebIDL::ExceptionOr<void> to_blob(JS::NonnullGCPtr<WebIDL::CallbackType> callback, DeprecatedString const& type, Optional<double> quality);
+    String to_data_url(StringView type, Optional<double> quality) const;
+    WebIDL::ExceptionOr<void> to_blob(JS::NonnullGCPtr<WebIDL::CallbackType> callback, StringView type, Optional<double> quality);
 
     void present();
 
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.idl b/Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.idl
index 485d778063..6ea01e08fd 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.idl
+++ b/Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.idl
@@ -5,7 +5,7 @@
 typedef (CanvasRenderingContext2D or WebGLRenderingContext) RenderingContext;
 
 // https://html.spec.whatwg.org/multipage/semantics.html#htmlcanvaselement
-[Exposed=Window, UseDeprecatedAKString]
+[Exposed=Window]
 interface HTMLCanvasElement : HTMLElement {
 
     [HTMLConstructor] constructor();
diff --git a/Userland/Libraries/LibWeb/WebDriver/Screenshot.cpp b/Userland/Libraries/LibWeb/WebDriver/Screenshot.cpp
index 3d79916cf3..f2a6405efe 100644
--- a/Userland/Libraries/LibWeb/WebDriver/Screenshot.cpp
+++ b/Userland/Libraries/LibWeb/WebDriver/Screenshot.cpp
@@ -36,11 +36,11 @@ static Response encode_canvas_element(HTML::HTMLCanvasElement const& canvas)
     auto data_url = canvas.to_data_url("image/png"sv, {});
 
     // 5. Let index be the index of "," in data url.
-    auto index = data_url.find(',');
+    auto index = data_url.find_byte_offset(',');
     VERIFY(index.has_value());
 
     // 6. Let encoded string be a substring of data url using (index + 1) as the start argument.
-    auto encoded_string = data_url.substring(*index + 1);
+    auto encoded_string = MUST(data_url.substring_from_byte_offset(*index + 1));
 
     // 7. Return success with data encoded string.
     return JsonValue { move(encoded_string) };