::-webkit-meter-suboptimum-value
Non-standard: This feature is not standardized. We do not recommend using non-standard features in production, as they have limited browser support, and may change or be removed. However, they can be a suitable alternative in specific cases where no standard option exists.
The ::-webkit-meter-suboptimum-value <meter> element when the value attribute falls outside of the low-high range and is not equivalent to the optimum value.
Yellow is the default color.
Syntax
css
::-webkit-meter-suboptimum-value {
/* ... */
}
Examples
This example will only work in browsers based on WebKit or Blink.
HTML
html
Normal:
<meter min="0" max="10" low="3" high="7" optimum="6" value="2">
Score 2/10
</meter>
<br />
Styled:
<meter id="styled" min="0" max="10" low="3" high="7" optimum="6" value="2">
Score 2/10
</meter>
CSS
css
body {
font-family: monospace;
}
.safari meter {
/* Reset the default appearance for Safari only */
/* .safari class is added via JavaScript */
-webkit-appearance: none;
}
#styled::-webkit-meter-suboptimum-value {
background: linear-gradient(
to bottom,
#ffff77,
#999900 45%,
#999900 55%,
#ffff77
);
height: 100%;
box-sizing: border-box;
}
JavaScript
js
/ Safari requires <meter> elements to have an `appearance` of `none` for custom styling
/ using `::-webkit-meter-*` selectors, but `appearance: none` breaks rendering on Chrome.
/ Therefore, we must check if the browser is Safari-based.
const isSafari =
navigator.userAgent.includes("AppleWebKit/") &&
!navigator.userAgent.includes("Chrome/");
if (isSafari) {
document.body.classList.add("safari");
}
Result
Specifications
Not part of any standard.
Browser compatibility
See also
The pseudo-elements used by WebKit/Blink to style other parts of a <meter> element are as follows: