Possible false validation error "Property d doesn't exist."

Hey!

I was attempting to validate the following CSS but recieved an error.

Been discussing it with the developer, and they are pretty sure it in fact is valid CSS.

Possible relevant info on the path d property: https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/d

It's also been tested on a lot of different devices, working fine.

Can this possible be a false positve by the CSS validation?

`/**

• • v2.0.0-beta7
• Copyright (c) 2023
• Licensed GPLv2+
  */

[data-color-mode*=updating] *:not(.ct-color-switch *)
{
transition: none !important;
}

[data-color-mode*=dark] [data-color-switch=normal],[data-color-mode*=light] [data-color-switch=reversed]
{
--is-toggled: var(--true);
--is-light-mode-visible: none;
--is-toggled-path: path("M-9 3h25a1 1 0 0017 13v30H0Z");
}

[data-color-mode*=dark] [data-color-switch=reversed],[data-color-mode*=light] [data-color-switch=normal]
{
--is-toggled: var(--false);
--is-dark-mode-visible: none;
}

@media(prefers-color-scheme: dark)
{
[data-color-mode=os-default] [data-color-switch=normal]
{
--is-toggled: var(--true);
--is-light-mode-visible: none;
--is-toggled-path: path("M-9 3h25a1 1 0 0017 13v30H0Z");
}

[data-color-mode=os-default] [data-color-switch=reversed]
{
--is-toggled: var(--false);
--is-dark-mode-visible: none;
}
}

@media(prefers-color-scheme: light)
{
[data-color-mode=os-default] [data-color-switch=normal]
{
--is-toggled: var(--false);
--is-dark-mode-visible: none;
}

[data-color-mode=os-default] [data-color-switch=reversed]
{
--is-toggled: var(--true);
--is-light-mode-visible: none;
--is-toggled-path: path("M-9 3h25a1 1 0 0017 13v30H0Z");
}
}

.ct-color-switch
{
--animation-duration: 300ms;
}

.ct-color-switch .ct-dark-mode-label
{
display: var(--is-dark-mode-visible, block);
}

.ct-color-switch .ct-light-mode-label
{
display: var(--is-light-mode-visible, block);
}

.ct-color-switch .ct-switch-type-expand :first-child path
{
d: var(--is-toggled-path, path("M0-11h25a1 1 0 0017 13v30H0Z"));
transition-delay: var(--is-toggled, calc(var(--animation-duration) * 0.4));
transition-timing-function: var(--is-toggled, cubic-bezier(0, 0, 0, 1.25));
}

.ct-color-switch .ct-switch-type-expand g path
{
transform: var(--is-toggled, scale(0.75));
transition-delay: var(--is-toggled, 0s);
}

.ct-color-switch .ct-switch-type-expand g circle
{
transform: var(--is-toggled, scale(1.4));
transition-delay: var(--is-toggled, 0s);
}

.ct-color-switch .ct-switch-type-within .ct-switch-type-within__circle
{
transform: var(--is-toggled, scale(1.5));
}

.ct-color-switch .ct-switch-type-within .ct-switch-type-within__inner
{
transform: var(--is-toggled, translate3d(3px, -3px, 0) scale(1.2));
}

.ct-color-switch .ct-switch-type-within g path
{
transform: var(--is-toggled, scale(0.65));
}

.ct-color-switch .ct-switch-type-dark-inner :first-child
{
transform: var(--is-toggled, rotate(180deg));
}

.ct-color-switch .ct-switch-type-dark-inner :last-child
{
transform: var(--is-toggled, rotate(-180deg));
}

.ct-color-switch .ct-switch-type-expand :first-child path
{
transition-property: transform,d;
transition-duration: calc(var(--animation-duration)*.6);
transition-timing-function: cubic-bezier(0, 0, 0.5, 1);
}

.ct-color-switch .ct-switch-type-expand g path,.ct-color-switch .ct-switch-type-expand g circle
{
transform-origin: center;
transition: transform calc(var(--animation-duration).65) cubic-bezier(0, 0, 0, 1.25) calc(var(--animation-duration).35);
}

.ct-color-switch .ct-switch-type-within *
{
transform-origin: center;
transition: transform calc(var(--animation-duration)) cubic-bezier(0, 0, 0, 1.25);
}

.ct-color-switch .ct-switch-type-dark-inner path
{
transform-origin: center;
transition: transform var(--animation-duration) ease;
}

@supports not (d: path(""))
{
.ct-color-switch .ct-switch-type-expand :first-child path
{
transform: var(--is-toggled, translate3d(-9px, 14px, 0));
}
}`