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Heading

Semantic heading element.

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The quick brown fox jumps over the lazy dog

<Heading>The quick brown fox jumps over the lazy dog</Heading>

API Reference

This component is based on the h1 element and supports common margin props.

PropTypeDefault
as
"h1" | "h2" | "h3" | "h4" | "h5" | "h6"
"h1"
asChild
boolean
No default value
size
Responsive<enum>
"6"
weight
Responsive<"light" | "regular" | "medium" | "bold">
No default value
align
Responsive<"left" | "center" | "right">
No default value
trim
Responsive<"normal" | "start" | "end" | "both">
No default value
truncate
boolean
No default value
wrap
Responsive<"wrap" | "nowrap" | "pretty" | "balance">
No default value
color
enum
No default value
highContrast
boolean
No default value

Examples

As another element

Use the as prop to change the heading level. This prop is purely semantic and does not change the visual appearance.

Level 1

Level 2

Level 3

<Heading as="h1">Level 1</Heading>

<Heading as="h2">Level 2</Heading>

<Heading as="h3">Level 3</Heading>

Size

Use the size prop to control the size of the heading. The prop also provides correct line height and corrective letter spacing—as text size increases, the relative line height and letter spacing decrease.

Heading sizes match Text sizes. However, the line heights are set a bit tighter as headings tend to be shorter than running text.

The quick brown fox jumps over the lazy dog

The quick brown fox jumps over the lazy dog

The quick brown fox jumps over the lazy dog

The quick brown fox jumps over the lazy dog

The quick brown fox jumps over the lazy dog

The quick brown fox jumps over the lazy dog

The quick brown fox jumps over the lazy dog

The quick brown fox jumps over the lazy dog

The quick brown fox jumps over the lazy dog

<Flex direction="column" gap="3">

  <Heading size="1">The quick brown fox jumps over the lazy dog</Heading>

  <Heading size="2">The quick brown fox jumps over the lazy dog</Heading>

  <Heading size="3">The quick brown fox jumps over the lazy dog</Heading>

  <Heading size="4">The quick brown fox jumps over the lazy dog</Heading>

  <Heading size="5">The quick brown fox jumps over the lazy dog</Heading>

  <Heading size="6">The quick brown fox jumps over the lazy dog</Heading>

  <Heading size="7">The quick brown fox jumps over the lazy dog</Heading>

  <Heading size="8">The quick brown fox jumps over the lazy dog</Heading>

  <Heading size="9">The quick brown fox jumps over the lazy dog</Heading>

</Flex>

Weight

Use the weight prop to set the text weight.

The quick brown fox jumps over the lazy dog.

The quick brown fox jumps over the lazy dog.

The quick brown fox jumps over the lazy dog.

<Heading weight="regular">

  The quick brown fox jumps over the lazy dog.

</Heading>



<Heading weight="medium">

  The quick brown fox jumps over the lazy dog.

</Heading>



<Heading weight="bold">

  The quick brown fox jumps over the lazy dog.

</Heading>

Align

Use the align prop to set text alignment.

Left-aligned

Center-aligned

Right-aligned

<Heading align="left">Left-aligned</Heading>

<Heading align="center">Center-aligned</Heading>

<Heading align="right">Right-aligned</Heading>

Trim

Use the trim prop to trim the leading space at the start, end, or both sides of the text box.

The prop works similarly to the upcoming half-leading control spec, but uses a common negative margin workaround under the hood for cross-browser support.

Without trim

With trim

<Flex direction="column" gap="3">

  <Heading
    trim="normal"
    style={{
      background: "var(--gray-a2)",
      borderTop: "1px dashed var(--gray-a7)",
      borderBottom: "1px dashed var(--gray-a7)",
    }}
  >

    Without trim

  </Heading>

  <Heading
    trim="both"
    style={{
      background: "var(--gray-a2)",
      borderTop: "1px dashed var(--gray-a7)",
      borderBottom: "1px dashed var(--gray-a7)",
    }}
  >

    With trim

  </Heading>

</Flex>

Trimming the leading is useful when dialing in vertical spacing in cards or other “boxy” components. Otherwise, padding looks larger on top and bottom than on the sides.

Without trim

The goal of typography is to relate font size, line height, and line width in a proportional way that maximizes beauty and makes reading easier and more pleasant.

With trim

The goal of typography is to relate font size, line height, and line width in a proportional way that maximizes beauty and makes reading easier and more pleasant.
<Flex direction="column" gap="3">

  <Box
    style={{
      background: "var(--gray-a2)",
      border: "1px dashed var(--gray-a7)",
    }}
    p="4"
  >

    <Heading mb="1" size="3">

      Without trim

    </Heading>

    <Text>

      The goal of typography is to relate font size, line height, and line width in a proportional way that maximizes beauty and makes reading easier and more

      pleasant.

    </Text>

  </Box>



  <Box
    p="4"
    style={{
      background: "var(--gray-a2)",
      border: "1px dashed var(--gray-a7)",
    }}
  >

    <Heading mb="1" size="3" trim="start">

      With trim

    </Heading>

    <Text trim="end">

      The goal of typography is to relate font size, line height, and line width in a proportional way that maximizes beauty and makes reading easier and more

      pleasant.

    </Text>

  </Box>

</Flex>

The default trim values are configured for the system font stack that’s used by Teasim Themes. If you are using custom fonts, you can adjust the trim values using the corresponding CSS variables.

.themes {

  --default-leading-trim-start: 0.42em;

  --default-leading-trim-end: 0.36em;

  --heading-leading-trim-start: 0.42em;

  --heading-leading-trim-end: 0.36em;

}

Truncate

Use the truncate prop to truncate text with an ellipsis when it overflows its container.

The quick brown fox jumps over the lazy dog

<Flex maxWidth="300px">

  <Heading truncate>The quick brown fox jumps over the lazy dog</Heading>

</Flex>

Wrap

Use the wrap prop to control text wrapping.

The quick brown fox jumps over the lazy dog

<Flex maxWidth="300px">

  <Heading wrap="nowrap">The quick brown fox jumps over the lazy dog</Heading>

</Flex>

The quick brown fox jumps over the lazy dog

<Flex maxWidth="300px">

  <Heading wrap="balance">The quick brown fox jumps over the lazy dog</Heading>

</Flex>

The quick brown fox jumps over the lazy dog

<Flex maxWidth="300px">

  <Heading wrap="pretty">The quick brown fox jumps over the lazy dog</Heading>

</Flex>

text-wrap: pretty is an experimental value that is not yet supported in all browsers. However, it can be treated as a progressive enhancement for browsers that do support it.

Color

Use the color prop to assign a specific color. The text colors are designed to achieve at least Lc 60 APCA contrast over common background colors.

The quick brown fox jumps over the lazy dog

The quick brown fox jumps over the lazy dog

The quick brown fox jumps over the lazy dog

The quick brown fox jumps over the lazy dog

<Flex direction="column">

  <Heading color="indigo">The quick brown fox jumps over the lazy dog</Heading>

  <Heading color="cyan">The quick brown fox jumps over the lazy dog</Heading>

  <Heading color="orange">The quick brown fox jumps over the lazy dog</Heading>

  <Heading color="crimson">The quick brown fox jumps over the lazy dog</Heading>

</Flex>

High-contrast

Use the highContrast prop to increase color contrast with the background.

The quick brown fox jumps over the lazy dog.

The quick brown fox jumps over the lazy dog.

<Flex direction="column">

  <Heading color="gray">The quick brown fox jumps over the lazy dog.</Heading>

  <Heading color="gray" highContrast>

    The quick brown fox jumps over the lazy dog.

  </Heading>

</Flex>
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