Re: [csswg-drafts] [css-inline] Leading control at start/end of block (#3240)

I haven't seen `x-height` as a possible value for `leading-trim-under`.

The approach is often used when setting flowing text next to images:

![Image with paragraph](https://i.imgur.com/YU7ccbG.png)

![X-height aligned with the top of the outlined image](https://i.imgur.com/6AfdIno.png)

I would go as far as using it for button centering:

![Centered button text](https://i.imgur.com/4QNNirX.png)

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