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meter-value-bounds

Enforce the inequalities required by HTML Living Standard §4.10.14 (the meter element):

  • min ≤ value ≤ max
  • min ≤ low ≤ max (when low is specified)
  • min ≤ high ≤ max (when high is specified)
  • min ≤ optimum ≤ max (when optimum is specified)
  • low ≤ high (when both are specified)

When min is omitted it defaults to 0; when max is omitted it defaults to 1; when value is omitted it defaults to min. Authored-but-unparsable attribute values are deferred to invalid-attr and skipped here to avoid compounding diagnostics.

❌ Examples of incorrect code for this rule

<meter value="10" max="5">10 out of 5</meter>
<meter value="5" min="3" optimum="1">5</meter>
<meter value="5" low="8" high="3">5</meter>

✅ Examples of correct code for this rule

<meter value="0.5">half</meter> <meter value="5" min="0" max="10" low="3" high="7" optimum="6">5</meter>

Interface​

{
  "meter-value-bounds": boolean
}

Enforce HTML LS inequalities between meter element attributes (min, max, value, low, high, optimum).

Default Severity​

error