Re: [csswg-drafts] [css-inline-3] vertical-align: super and font metrics (#5225)

The CSS Working Group just discussed `https://github.com/w3c/csswg-drafts/issues/5225`, and agreed to the following:

* `RESOLVED: 0.2em and 1/3 em are the ratios for super and sub script`

<details><summary>The full IRC log of that discussion</summary>
&lt;dael> topic: https://github.com/w3c/csswg-drafts/issues/5225<br>
&lt;dael> github: https://github.com/w3c/csswg-drafts/issues/5225<br>
&lt;dael> fantasai: [lists ratios used by each browser]<br>
&lt;dael> fantasai: All slightly off but fairly close<br>
&lt;dael> fantasai: I prop 0.2em and 1/3em and put that is spec<br>
&lt;dael> florian: +1px seems very specific<br>
&lt;dael> koji: I checked commit log and added hyatt. So it's old code<br>
&lt;dael> florian: In that case sure<br>
&lt;dael> fantasai: Prop 0.2em and 1/3em. Slightly different but very close for everyone<br>
&lt;dael> Rossen_: Thoughts or objections?<br>
&lt;dael> koji: Do we have myles?<br>
&lt;dael> Rossen_: 12 more minutes<br>
&lt;dael> fantasai: Safari is using 0.2005 and 1/3em<br>
&lt;dael> smfr: That was me measuing on screen so not gospel<br>
&lt;faceless2> s/smfr/faceless2/<br>
&lt;dael> Rossen_: As any other decision we can change our minds<br>
&lt;dael> Rossen_: Would be reasonable<br>
&lt;faceless2> Pretty sure smfr could give gospel answer!<br>
&lt;dael> Rossen_: Objections to 0.2ema nd 1/3 em are the ratios for super and sub script?<br>
&lt;dael> RESOLVED: 0.2em and 1/3 em are the ratios for super and sub script<br>
</details>


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