Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

rem() - New CSS functional notation #23183

Merged
merged 16 commits into from
Jan 4, 2023
Merged

rem() - New CSS functional notation #23183

Changes from 5 commits
Commits
Show all changes
16 commits
Select commit Hold shift + click to select a range
31e4d33
`rem()` - New CSS functional notation
ramiy Dec 25, 2022
faeaadb
Fix lint issues
ramiy Dec 25, 2022
b0c26f2
Update code examples
ramiy Dec 25, 2022
04375a0
Add more code examples covering additional use cases
ramiy Dec 28, 2022
ea141e5
Update index.md
ramiy Dec 28, 2022
6ed05da
Return value
ramiy Dec 28, 2022
bfafa50
Apply suggestions from code review
ramiy Dec 30, 2022
9e32c12
Update index.md
ramiy Dec 30, 2022
a682a70
Update index.md
ramiy Dec 30, 2022
4711816
Apply suggestions from code review
ramiy Dec 30, 2022
f429474
Update index.md
ramiy Dec 30, 2022
a109123
Apply suggestions from code review
ramiy Dec 31, 2022
d0fbcf1
Apply suggestions from code review
ramiy Jan 3, 2023
b0cfc4f
Update index.md
ramiy Jan 3, 2023
1647651
Add examples with calculations
ramiy Jan 3, 2023
8d42f72
lint
ramiy Jan 3, 2023
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Jump to
Jump to file
Failed to load files.
Diff view
Diff view
19 changes: 10 additions & 9 deletions files/en-us/web/css/rem/index.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -16,22 +16,23 @@ browser-compat: css.types.rem

{{CSSRef}}{{SeeCompatTable}}

The **`rem()`** [CSS](/en-US/docs/Web/CSS) [function](/en-US/docs/Web/CSS/CSS_Functions) returns a remainder (with the same sign as the dividend) when dividing one number by another. The remainder is a left over when one operand is divided by a second operand. It always takes the sign of the dividend.
The **`rem()`** [CSS](/en-US/docs/Web/CSS) [function](/en-US/docs/Web/CSS/CSS_Functions) returns a remainder (with the same sign as the dividend) when dividing one number by another. The remainder is a leftover when one operand is divided by a second operand. It always takes the sign of the dividend.
ramiy marked this conversation as resolved.
Show resolved Hide resolved

> When dividing 12 by 5, the result is 10 with a remainder of 2. The full calculation is `12 / 5 = 10 (2)`. The `rem()` function returns the reminder.
> When dividing 27 by 5, the result is 25 with a remainder of 2. The full calculation is `27 / 5 = 5 * 5 + 2`. The `rem(27, 5)` function returns the remainder of `2`.
ramiy marked this conversation as resolved.
Show resolved Hide resolved

## Syntax

```css
/* Unitless values */
/* Unitless <number> */
line-height: rem(21, 2); /* 1 */
line-height: rem(14, 5); /* 4 */
line-height: rem(5.5, 2); /* 1.5 */

/* Unit based values */
margin: rem(14%, 3%); /* 2% */
margin: rem(18px, 5px); /* 3px */
margin: rem(25vmin, 7vmin); /* 4vmin */
/* Unit based <percentage> and <dimension> */
margin: rem(14%, 3%); /* 2% */
margin: rem(18px, 5px); /* 3px */
margin: rem(10rem, 6rem); /* 4rem */
margin: rem(26vmin, 7vmin); /* 5vmin */
ramiy marked this conversation as resolved.
Show resolved Hide resolved

/* Negative/positive values */
rotate: rem(200deg, 30deg); /* 20deg */
Expand All @@ -42,7 +43,7 @@ rotate: rem(-55deg, -15deg); /* -10deg */

### Parameter

The `rem(dividend, divisor)` function accepts two comma-separated values as its parameters. Both parameters must have the same type, or else the function is invalid.
The `rem(dividend, divisor)` function accepts two comma-separated values as its parameters. Both parameters must have the same type for the function to be valid.
ramiy marked this conversation as resolved.
Show resolved Hide resolved

- `dividend`
- : A calculation that resolves to a {{CSSxREF("&lt;number&gt;")}}, {{CSSxREF("&lt;dimension&gt;")}}, or {{CSSxREF("&lt;percentage&gt;")}} representing the dividend.
Expand All @@ -52,7 +53,7 @@ The `rem(dividend, divisor)` function accepts two comma-separated values as its

### Return value

Returns a {{CSSxREF("&lt;number&gt;")}}, {{CSSxREF("&lt;dimension&gt;")}}, or {{CSSxREF("&lt;percentage&gt;")}} (the same type as the parameters) representing the remainder, that is, the operation left over.
Returns a {{CSSxREF("&lt;number&gt;")}}, {{CSSxREF("&lt;dimension&gt;")}}, or {{CSSxREF("&lt;percentage&gt;")}} (corresponds to the parameters' type) representing the remainder, that is, the operation leftover.

- If `divisor` is `0`, the result is `NaN`.
- If `dividend` is `infinite`, the result is `NaN`.
Expand Down