From e8442cdfb21a746bfb3b5503c637a6fe8895bead Mon Sep 17 00:00:00 2001
From: Adrian Cochrane <adrian@openwork.nz>
Date: Mon, 20 Apr 2020 20:59:59 +1200
Subject: [PATCH] ISSUES: Plan psuedoclass lowering.

---
 ISSUES/psuedoclass-lowering.md | 40 ++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/ISSUES/psuedoclass-lowering.md b/ISSUES/psuedoclass-lowering.md
index eb22a8e..b457287 100644
--- a/ISSUES/psuedoclass-lowering.md
+++ b/ISSUES/psuedoclass-lowering.md
@@ -17,3 +17,43 @@ pages without JavaScript.
 
 However it is probably wise to discourage such patterns, as they do not
 communicate necessary state to accessibility tools.
+
+## Lowering Rules
+`:active` -> interactive
+`:any-link`, `:link` -> `:where([href], [src])`
+`:blank` -> `:where(input[value=""])`
+`:checked` -> `[checked]`
+`:default` -> UNSUPPORTED (forms)
+`:defined` -> UNSUPPORTED (custom elements)
+`:dir(_)` -> `:where([dir=_], [dir=_] *)`
+`:disabled` -> `[disabled]`
+`:empty` -> would need to be handled by XML Conduit Stylist.
+`:enabled` -> `:not([disabled])`
+`:first-child` -> `:nth-child(1)`
+`:first-of-type` -> `:nth-of-type(1)`
+`:fullscreen` -> Handled elsewhere.
+`:focus`, `:focus-visible` -> interactive
+`:focus-within` -> interactive
+`:host` -> UNSUPPORTED (custom elements)
+`:host()` -> UNSUPPORTED (custom elements)
+`:host-context()` -> UNSUPPORTED (custom elements)
+`:hover` -> interactive
+`:indeterminate` -> `[indeterminate]`
+`:in-range` -> UNSUPPORTED (forms)
+`:invalid` -> UNSUPPORTED (forms)
+`:lang(_)` -> `:where([lang|=_], [lang|=_] *)`
+`:last-child` -> `:nth-last-child(1)`, PROBABLY UNSUPPORTED
+`:last-of-type` -> `:nth-last-of-type(1)`, PROBABLY UNSUPPORTED
+`:only-child` -> `:nth-child(1):nth-last-child(1)`, PROBABLY UNSUPPORTED
+`:only-of-type` -> `:nth-of-type(1):nth-last-of-type(1)`, PROBABLY UNSUPPORTED
+`:optional` -> `:not([required])`
+`:out-of-range` -> UNSUPPORTED (forms)
+`:placeholder-shown` -> `:where(:not([value]), [value=""])`
+`:readonly` -> `[readonly]`
+`:read-write` -> `:not([readonly])`
+`:required` -> `[required]`
+`:root`, `:scope` -> `html`, or applied by XML Conduit stylist for more leniency.
+`:state()` -> UNSUPPORTED (custom elements), may want an alternative.
+`:target` -> `#_`, selected ID sourced from outside data.
+`:valid` -> UNSUPPORTED (forms)
+`:visited` -> requires special handling, with outside data.
-- 
2.30.2