HTML and CSS cheatsheet

HTML and CSS cheatsheet Color text based on background color with CSS

.text-based-on-background {
  --bg: #ccc;
  background: var(--bg);
  color: lch(from var(--bg) calc((49.44 - l) * infinity) 0 0);
}

Text based on background

More info at devongovett.

Use attr(id type(<custom-ident>), none) for view transition names

Or use attr like color: attr(data-custom-color type(<color>), red); to read <p data-custom-color='blue'></p>

More info at bram.us.

field-sizing to resize textarea, select, and input

If using field-sizing define min-block-size min-inline-size max-inline-size to constrain the element from becoming too much small or too much large.

textarea, select, input {
  field-sizing: content;
}
textarea {
  min-block-size: 3.5rlh;
  min-inline-size: 20ch;
  max-inline-size: 50ch;
}

select {
  min-inline-size: 5ch;
  min-block-size: 1.5lh;
}

input {
  min-inline-size: 7ch;
}

Examples

interpolate-size calc-size() to animate width and height

Prevously this required JavaScript. Now it just works with CSS:

:root {
    interpolate-size: allow-keywords;
}
div p {
  overflow: hidden;
  transition: all 0.2s;
  height: 0;
}

div:hover p {
  height: auto; /* this will now animate */
}

Hover me

Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

More info at developer.chrome.com.

...post will be updated over time