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Modern CSS reset

I put together a CSS Reset that uses modern CSS features such as :where(), logical properties, prefers-reduced-motion, etc. ✨

Lots of inspiration from Josh W Comeau, Andy Bell, and Adam Argyle.

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/*
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(fieldset, progress, meter)) {
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;
word-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;
}

/* Fix h1 font size inside article, aside, nav, and section */
h1 {
font-size: 2em;
}

/* Position list marker inside */
:where(ul, ol) {
list-style-position: inside;
}

/* 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 145ms cubic-bezier(0.25, 0, 0.4, 1);
}
:where(:not(:active)):focus-visible {
transition-duration: 0.25s;
}
}
:where(:not(:active)):focus-visible {
outline-offset: 5px;
}

/* 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;
}