Edge issues

[kahsieh]

Fonts

• Incorrect placement of bopomofo tone marks in vertical writing mode: https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/16525660/

Layout

• ruby-position: inter-character not supported
• <rtc style="writing-mode: vertical-rl"> works by fallback to span

[bobbytung]

Edge 18版不支援Text-orientation: upright，所以國語調號無法強制轉正來啟動字型功能。但閩南語調號卻正常運作。不過Edge很快就要換成Chromium核心了。