Variations in Sub Tags counts how many of your keyword’s variations appear inside subscript (<sub>) elements on the page. It returns a whole number, and on almost every page that number is legitimately zero — subscript is a rare, notation-specific place for keywords to live, so a high count is unusual rather than desirable.
| Factor ID | RG-KWD-085 |
|---|---|
| Family | Keyword Usage & Density |
| Measurement | Variation occurrence count |
| Measured zone | Raw captured sub contents |
What it measures
This factor counts keyword variations that appear inside subscript elements. It looks only at text wrapped in <sub> tags — the small, lowered characters used for chemical formulas, mathematical indices, and similar notation — and tallies how many of your tracked keyword variations show up there.
How RankGear measures it
RankGear extracts the inner contents of recognized sub tags — capture group two of the match — without cleaning that text, then counts case-insensitive, whole-word matches against your keyword variations. Because the captured text is left uncleaned, any nested markup inside the subscript stays in the string that gets searched.
What RankGear looks for
<sub>(captured contents)</sub>
// counts whole-word variation matches, case-insensitive
H<sub>2</sub>O → "2" captured
x<sub>keyword</sub> → "keyword" captured, matchedHow to optimize it
Treat this as an observation, not a target. Use subscript only where it is scientifically, mathematically, or typographically correct — chemical formulas, indices, and footnote markers. Do not add or force keyword variations into <sub> tags to move this count; a zero here is normal and expected for the vast majority of pages.
Important considerations
- Nested markup inside a subscript remains in the captured text, because the contents are matched without cleaning.
- Short symbols (a lone digit or letter) often will not match a full keyword term, so genuine notation usually contributes nothing to the count.
- Most pages legitimately score zero — an empty result is the norm, not a deficiency.
- Do not misuse subscript for topical repetition; forcing keywords into
<sub>harms readability and correct semantics. - This is a correlation-based prioritization signal within a measured result set. A count here does not by itself make a page rank or guarantee any position.
Related factors
Part of the Factors reference · how RankGear measures · glossary.