using WGLMakie, JSServe
io = IOBuffer()
println(io, "~~~")
show(io, MIME"text/html"(), Page(exportable=true, offline=true))
app = JSServe.App() do
    return DOM.div(
        scatter(1:4),
        surface(rand(4, 4)),
        JSServe.Slider(1:3)
    )
end
show(io, MIME"text/html"(), app)
println(io, "~~~")
println(String(take!(io)))

MethodError: no method matching show(::IOBuffer, ::MIME{Symbol("text/html")}, ::Nothing) Closest candidates are: show(::IO, ::Union{MIME{Symbol("text/html")}, MIME{Symbol("application/prs.juno.plotpane+html")}}, !Matched::JSServe.App) at ~/.julia/packages/JSServe/KDXZU/src/display.jl:59 show(::IO, !Matched::MIME{Symbol("text/csv")}, ::Any) at /opt/hostedtoolcache/julia/1.7.3/x64/share/julia/stdlib/v1.7/DelimitedFiles/src/DelimitedFiles.jl:829 show(::IO, !Matched::MIME{Symbol("text/tab-separated-values")}, ::Any) at /opt/hostedtoolcache/julia/1.7.3/x64/share/julia/stdlib/v1.7/DelimitedFiles/src/DelimitedFiles.jl:830 ...