I thought classes starting with an hyphen are reserved for browser vendors[1]. Maybe this changed since the last time I checked the spec. [1] = https://www.w3.

I thought classes starting with an hyphen are reserved for browser vendors[1]. Maybe this changed since the last time I checked the spec. [1] = https://www.w3.org/TR/CSS21/syndata.html#vendor-keywords https://www.w3.org/TR/CSS21/syndata.html#vendor-keywords