diff --git a/src/ImageShow.jl b/src/ImageShow.jl
index a3ebb80..5c8d7bc 100644
--- a/src/ImageShow.jl
+++ b/src/ImageShow.jl
@@ -9,13 +9,6 @@ using StackViews
 using ImageCore.MappedArrays
 using ImageCore.PaddedViews
 
-# opt-in HTML render for image
-# work around https://github.com/JuliaImages/ImageShow.jl/pull/50#issuecomment-1124132500
-const _ENABLE_HTML = Ref(false)
-enable_html_render() = _ENABLE_HTML[] = true
-disable_html_render() = _ENABLE_HTML[] = false
-Base.showable(::MIME"text/html", ::AbstractMatrix{<:Colorant}) = _ENABLE_HTML[]
-
 include("showmime.jl")
 include("gif.jl")
 include("multipage.jl")
diff --git a/test/runtests.jl b/test/runtests.jl
index c32d32c..6b95b7c 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -1,6 +1,4 @@
 using Test
-using ImageShow
-ImageShow.enable_html_render()
 
 @testset "ImageShow" begin
     include("writemime.jl")
diff --git a/test/writemime.jl b/test/writemime.jl
index 3b85877..fb7c5ec 100644
--- a/test/writemime.jl
+++ b/test/writemime.jl
@@ -169,6 +169,10 @@ end
             else # ImageMagick
                 "<img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGQAAABkAQAAAABY"
             end)
+        @testset "Pluto integration" begin
+            # Pluto's integration (https://github.com/fonsp/Pluto.jl/pull/2108) depends on the Colorant type being available:
+            @test_nowarn ImageShow.Colorant
+        end
     end
 end
 try