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How can I create a Typst document that adheres to the OS font?
I provide documents that must be accessible to the dyslexic and [my/hyper]opic.
With CSS3, I am able to specify system-ui, where required. However, all browser stylesheets default to that, regardless. Typst appears to provide no equivalent.
Worse, typst fonts fails to enumerate all FontConfig aliases:
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import subprocess import xml.etree.ElementTree as ET from pathlib import Path def resolve_fontconfig_files(seed: Path, visited: set[Path] | None = None) -> list[Path]: """Recursively resolve all FontConfig config files via <include> directives.""" if visited is None: visited = set() seed = seed.resolve() if not seed.exists() or seed in visited: return [] visited.add(seed) files: list[Path] = [seed] try: tree = ET.parse(seed) except ET.ParseError: return files for include in tree.getroot().iter("include"): text = (include.text or "").strip() if not text: continue target = (seed.parent / text).resolve() if target.is_dir(): for child in sorted(target.glob("*.conf")): files.extend(resolve_fontconfig_files(child, visited)) else: files.extend(resolve_fontconfig_files(target, visited)) return files def collect_alias_names() -> list[str]: """Extract declared alias names from FontConfig XML config files.""" roots: list[Path] = [ Path("/etc/fonts/fonts.conf"), Path.home() / ".config/fontconfig/fonts.conf", Path.home() / ".fonts.conf", ] names: list[str] = [] seen: set[str] = set() visited: set[Path] = set() for root in roots: for path in resolve_fontconfig_files(root, visited): try: tree = ET.parse(path) except ET.ParseError: continue for alias_el in tree.getroot().iter("alias"): family_el = alias_el.find("family") if family_el is None or not (family_el.text or "").strip(): continue # Skip reverse mappings (real font → generic); they only have # <accept> or <default>, never <prefer>. if alias_el.find("prefer") is None: continue name = family_el.text.strip() if name not in seen: seen.add(name) names.append(name) return names def resolve_alias(alias: str) -> list[str]: """Use fc-match to resolve an alias to its ordered list of families.""" result = subprocess.run( ["fc-match", "--sort", "--format=%{family}\\n", alias], capture_output=True, text=True, ) families: list[str] = [] seen: set[str] = set() for line in result.stdout.splitlines(): name = line.strip() if name and name not in seen: seen.add(name) families.append(name) return families def enumerate_fontconfig_aliases() -> dict[str, list[str]]: """Return a mapping of alias name → resolved font families via fc-match.""" return {alias: resolve_alias(alias) for alias in collect_alias_names()} if __name__ == "__main__": import pprint pprint.pprint(collect_alias_names()) -
['system-ui', 'sans-serif', 'monospace', 'FontAwesome', 'emoji', 'math', 'serif', 'fantasy', 'cursive']
Consequently, I can't even revert to kcm_fonts's typeface:
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#!/usr/bin/env bash grep -i font $HOME/.config/kdeglobals | jc --ini | jq | yq -P -
font: Monospace,10,-1,5,400,0,0,0,0,0,0,0,0,0,0,1 menuFont: Monospace,10,-1,5,400,0,0,0,0,0,0,0,0,0,0,1 smallestReadableFont: Monospace,10,-1,5,400,0,0,0,0,0,0,0,0,0,0,1 toolBarFont: Monospace,10,-1,5,400,0,0,0,0,0,0,0,0,0,0,1 activeFont: Monospace,10,-1,5,400,0,0,0,0,0,0,0,0,0,0,1
I don't understand how one is supposed to create accessible markup, if the document cannot dynamically adhere to the DE's typeface, and the size thereof.
Context
My primary interest in Typst is that it appears to resolve what github.com/whatwg/html/issues/8751#issuecomment-2676253060 describes. However, these deficiencies must be resolved before it's usable. Considering that accessibility of the focus of both, I hope that that is sensical.
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