I want 2D matrix dropdown form inputs

[WebWeWantBot]

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title: I want 2D matrix dropdown form inputs
date: 2024-01-21T11:00:18.245Z
submitter: Christoph Päper
number: 65acf9429228300d00ff0a25
tags: [ ]
discussion: https://github.com/WebWeWant/webwewant.fyi/discussions/
status: [ discussing || in-progress || complete ]
related:

• title:
  url:
  type: [ article || explainer || draft || spec || note || discussion ]

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Several types of clothing have a size designation that consists of two parts, one is usually primary and the other secondary and both must be specified and most combinations exist. Examples from EN 13402-2 include jeans (girth + length) and bras (girth + cup), but also shoes sometimes (length + width). This is also applicable to many other variant items that are frequently required to be selected together in forms, e.g. S/M/L + cola/soda/water or light/regular/bold + italic/upright or 1…31 + Jan…Dec or

<matrix>
  <select>…</select>
  <select>…</select>
</matrix>

<select type=primary>…</select>
<select type=secondary>…</select>

<select id=primary>…</select>
<select with=primary>…</select>

I also want typed numeric input fields with number and unit and automatic conversion to canonical unit.

<input type=length min=0.001 max=100000 units="m, km, cm, mm, in, ft, yd, mi">

<input type=number min=0.001 max=100000 dim=meter id=value>
<input type=unit with=value valid="m, km, cm, mm, in, ft, yd, mi">

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