Runtime type error when using CSS in an SVG element's attributes

[colinlogue]

The following code compiles but throws Uncaught TypeError: Cannot set property className of #<SVGElement> which has only a getter in Chrome (and a similar error in Firefox):

module Main exposing (main)

import Html.Styled exposing (toUnstyled)
import Html.Styled.Attributes exposing (css)
import Svg.Styled exposing (svg)

main =
    svg [ css [] ] []
        |> toUnstyled

Ellie: https://ellie-app.com/fCySBLMNKcWa1

There is no error when importing the css function from Svg.Styled.Attributes.

[Confidenceman02]

I got the exact same error when updating a side project to latest elm-css. Everything compiles fine but viewing in the browser I get the error mentioned.

My use case was -

import Svg.Styled.Attributes exposing (css)

svg
    [  viewBox "0 0 200 400"
    ,  css [  Css.width (Css.px 140)  ]
    ]
    []

I can understand why this looks dodgy as svg attributes like width tend to just be string values, not px. It was however working fine with versions <17.

My fix was to use the following -

 svg
    [  viewBox "0 0 200 400"
    ,  SvgAttribs.width (Css.num 140).value
    ]
    []

It worries me that the compiler doesn't protect against this. Will definitely need to go through projects and ensure everything still works.

[Confidenceman02]

This seems far more serious than I thought actually. All of the css I have added to svg elements just blows up the browser when they are rendered.

I have had to work around this by adding styles to wrapping elements, including animations.
Eeesh..

[Confidenceman02]

Think this could be the issue. From what I can understand className is deprecated for svg elements. Seems this was introduced in 17.0.2

[Confidenceman02]

I have a working fork here https://github.com/Confidenceman02/elm-css.

All tests passing but not totally sure what the ramifications are when using class intead of className for all DOM elements. className will for sure not work with svg.

[Confidenceman02]

After some talks with @robinheghan I tried out using VirtualDom.attribute and that does the job nicely. Will Open PR.

[rtfeldman]

Fixed in 17.0.3!