On Wednesday, February 17, 2021 at 12:57:41 PM UTC-6, Dirk Fieldhouse wrote: > On 17/02/2021 03:28, AK wrote: > > When I post a question here, the box for "post your question" disappears > > when I hover my mouse over it. > > > > https://askubuntu.com/ > > > > It acts normally with Firefox. > > > > Any idea what is causing it? > The button has this CSS background-color from its class s-btn__primary: > var(--theme-button-primary-background-color) > > See > <https://blog.logrocket.com/how-to-create-better-themes-with-css-variables-5a3744105c74/> > > for discussion of this syntax. These CSS variables are part of a site theme. > > --theme-button-primary-background-color means --theme-primary-color, > which is hsl(12.87958115,76.70682731%,48.82352941%) -- call it "brick"; > > On hover, the button gets its background-color from its class > > var(--theme-button-primary-hover-background-color) > > --theme-button-primary-hover-background-color means > --theme-primary-color-darken-5, the brick colour with 43.82352941% > lightness. > > --theme-primary-color-darken-5 is defined using calc(), like this > > hsl( h, s, calc(var(--theme-primary-color-l) - 5%) > > but units inside calc() were not supported until FF57, and not in > <color> context until FF59. In SM 2.53.6, FF52, etc, apparently colours > specified with calc() default to white. SeaMonkey needs to acquire the > Stylo CSS engine. > > Notably the button text is styled white regardless of hovering, as the > theme doesn't contain variables like --theme-button-text-color and > --theme-button-text-hover-color. > > Consequently the button seems to disappear on hovering. > > This CSS can be injected to correct the display for the default site theme: > > .s-btn__primary:hover,.s-btn__primary:focus,.s-btn__primary:active { > color:#fff; > background-color:hsl(12.87958115,76.70682731%,43.82352941%); > } > > An extension like StyleM is good for this. > > Why anyone would think it's worthwhile to create this CSS is a mystery. > Affordance effects like button hovering ought to be consistent across > not just the browser and all websites displayed in it but all other > applications on the same GUI platform. > > /df > > -- > London > UK Thanks for the explanation.
Andy _______________________________________________ support-seamonkey mailing list [email protected] https://lists.mozilla.org/listinfo/support-seamonkey
