::-webkit-meter-optimum-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-optimum-value CSS pseudo-element styles the element when its value is inside the low-high range, or when the value is equivalent to the optimum value.

Green is the default color.

Syntax

css

::-webkit-meter-optimum-value {
  /* ... */
}

Examples

This example will only work in browsers based on WebKit or Blink.

HTML

html

Normal:

  Score 6/10



Styled:

  Score 6/10

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-optimum-value {
  background: linear-gradient(to bottom, #7f7, #090 45%, #090 55%, #7f7);
  height: 100%;
  box-sizing: border-box;
}

JavaScript

// Safari requires  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 is_safari =
  navigator.userAgent.includes("AppleWebKit/") &&
  !navigator.userAgent.includes("Chrome/");

if (is_safari) {
  document.body.classList.add("safari");
}

Result

Specifications

Not part of any standard.