CSS Reset

reset.css

/*
  Made by Elly Loel - https://ellyloel.com/
  With inspiration from:
    - Josh W Comeau - https://courses.joshwcomeau.com/css-for-js/treasure-trove/010-global-styles/
    - Andy Bell - https://piccalil.li/blog/a-modern-css-reset/
    - Adam Argyle - https://unpkg.com/open-props@1.3.16/normalize.min.css / https://codepen.io/argyleink/pen/KKvRORE

  Notes:
    - `:where()` is used to lower specificity for easy overriding.
*/

* {
  /* Remove default margin on everything */
  margin: 0;
  /* Remove default padding on everything */
  padding: 0;
  /* Calc `em` based line height, bigger line height for smaller font size and smaller line height for bigger font size: https://kittygiraudel.com/2020/05/18/using-calc-to-figure-out-optimal-line-height/ */
  line-height: calc(0.25rem + 1em + 0.25rem);
}

/* Use a more-intuitive box-sizing model on everything */
*,
::before,
::after {
  box-sizing: border-box;
}

/* Remove border and set sensible defaults for backgrounds, on all elements except fieldset progress and meter */
*:where(:not(progress, meter, input, button)) {
  border-width: 0;
  border-style: solid;
  background-origin: border-box;
  background-repeat: no-repeat;
}

html {
  /* Allow percentage-based heights in the application */
  block-size: 100%;
  /* Making sure text size is only controlled by font-size */
  -webkit-text-size-adjust: none;
}

/* Smooth scrolling for users that don't prefer reduced motion */
@media (prefers-reduced-motion: no-preference) {
  html:focus-within {
    scroll-behavior: smooth;
  }
}

body {
  /* Improve text rendering */
  -webkit-font-smoothing: antialiased;
  /* https://marco.org/2012/11/15/text-rendering-optimize-legibility */
  text-rendering: optimizeSpeed;
  /* Allow percentage-based heights in the application */
  min-block-size: 100%;
  /* https://developer.mozilla.org/en-US/docs/Web/CSS/scrollbar-gutter#example_2 */
  /* scrollbar-gutter: stable both-edges; Removed until this bug is fixed: https://bugs.chromium.org/p/chromium/issues/detail?id=1318404#c2 */
}

/* Improve media defaults */
:where(img, svg, video, canvas, audio, iframe, embed, object) {
  display: block;
}
:where(img, svg, video) {
  block-size: auto;
  max-inline-size: 100%;
}

/* Remove stroke and set fill colour to the inherited font colour */
:where(svg) {
  stroke: none;
  fill: currentColor;
}

/* SVG's without a fill attribute */
:where(svg):where(:not([fill])) {
  /* Remove fill and set stroke colour to the inherited font colour */
  stroke: currentColor;
  fill: none;
  /* Rounded stroke */
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Set a size for SVG's without a width attribute */
:where(svg):where(:not([width])) {
  inline-size: 5rem;
}

/* Remove built-in form typography styles */
:where(input, button, textarea, select),
:where(input[type="file"])::-webkit-file-upload-button {
  color: inherit;
  font: inherit;
  font-size: inherit;
  letter-spacing: inherit;
}

/* Change textarea resize to vertical only and block only if the browser supports that */
:where(textarea) {
  resize: vertical;
}
@supports (resize: block) {
  :where(textarea) {
    resize: block;
  }
}

/* Avoid text overflows */
:where(p, h1, h2, h3, h4, h5, h6) {
  overflow-wrap: break-word;
}

/* Remove list styles on ul, ol elements with a list role, which suggests default styling will be removed */
:where(ul, ol)[role="list"] {
  list-style: none;
}

/* More readable underline style for anchor tags without a class. This could be set on anchor tags globally, but it can cause conflicts. */
a:not([class]) {
  text-decoration-skip-ink: auto;
}

/* Make it clear that interactive elements are interactive */
:where(a[href], area, button, input, label[for], select, summary, textarea, [tabindex]:not([tabindex*="-"])) {
  cursor: pointer;
  touch-action: manipulation;
}
:where(input[type="file"]) {
  cursor: auto;
}
:where(input[type="file"])::-webkit-file-upload-button,
:where(input[type="file"])::file-selector-button {
  cursor: pointer;
}

/* Animate focus outline */
@media (prefers-reduced-motion: no-preference) {
  :focus-visible {
    transition: outline-offset 0.1s cubic-bezier(0.25, 0, 0.4, 1);
  }
  :where(:not(:active)):focus-visible {
    transition-duration: 0.1s;
  }
}
:where(:not(:active)):focus-visible {
  outline-offset: 4px;
}

/* Make sure users can't select button text */
:where(button, button[type], input[type="button"], input[type="submit"], input[type="reset"]),
:where(input[type="file"])::-webkit-file-upload-button,
:where(input[type="file"])::file-selector-button {
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
  user-select: none;
  text-align: center;
}

/* Disabled cursor for disabled buttons */
:where(button, button[type], input[type="button"], input[type="submit"], input[type="reset"])[disabled] {
  cursor: not-allowed;
}

:where(s::before, s::after),
.sr-only {
  border: 0 !important;
  clip: rect(1px, 1px, 1px, 1px) !important;
  -webkit-clip-path: inset(50%) !important;
  clip-path: inset(50%) !important;
  height: 1px !important;
  margin: -1px !important;
  overflow: hidden !important;
  padding: 0 !important;
  position: absolute !important;
  width: 1px !important;
  white-space: nowrap !important;
}

.sr-only.but-focusable-by-all:focus,
.sr-only.but-focusable-by-all:active {
  clip: auto !important;
  -webkit-clip-path: none !important;
  clip-path: none !important;
  height: auto !important;
  margin: auto !important;
  overflow: visible !important;
  width: auto !important;
  white-space: normal !important;
}

:where(s::before) {
  content: " [start of stricken text] ";
}

[lang="it"] :where(s::before) {
  content: " [Inizio testo sbarrato] ";
}

:where(s::after) {
  content: " [end of stricken text] ";
}

[lang="it"] :where(s::before) {
  content: " [Fine testo sbarrato] ";
}

@media all and (display-mode: standalone) {
  /* rules for full-screen/kiosk mode */
}

@media (any-hover: none) {
  /* touch devices only, hover option not available */
}

/* Styles for all high contrast modes: */
@media screen and (-ms-high-contrast: active) { }

/* Styles for the Windows "High Contrast Black" theme: */
@media screen and (-ms-high-contrast: white-on-black) { }

/* Styles for the windows "High Contrast White" theme: */
@media screen and (-ms-high-contrast: black-on-white) { }



/* skip navigation link */
/*
:where(
  th:not([scope]):not([id]),
  table:has(th[id]) td:not([headers])
){

}
*/

/*
:where(
   iframe:not([title]),
   img:not([alt]),
   table > :first-child:not(caption)
)


:where(img:not([aria-labelledby]):not([aria-label]):not([alt])) {

}

:where(img[src$=".svg"]:not([role="img"])) {

}

:where(svg:not([role="img"])) {

}

:where(svg:not(:has(title))) {

}

body.a11y:has(img[src$=".svg"]:not([role="img"]))::before {  
  content: 'Warning: an informative SVG images should set role="img"';
  color: var(--warning);
}
*/

main:not([tabindex="-1"])::before {
   content: 'tabindex="-1" should be set for the <main> element';
   color: #d12420;
   outline: 1px solid currentColor;
   padding: .5rem .25rem;
}