Default style for option

[zcorpan]

From rocallahan/innerText-spec#5 (comment)

It appears that option (outside a select) is display:block by default in Gecko and Chromium. In IE it is inline. In WebKit it is not rendered (seemingly like display:none but no such declaration per devtools).

Gecko has lots of styles apart from display:block
https://dxr.mozilla.org/mozilla-central/source/layout/style/res/forms.css#341

Chromium
https://cs.chromium.org/chromium/src/third_party/WebKit/Source/core/css/html.css?l=773

WebKit
https://github.com/WebKit/webkit/blob/e75143bef79009cec709c2208cfde886435d75a5/Source/WebCore/css/html.css#L920

IE/Edge
Like display:inline?

The spec
https://html.spec.whatwg.org/multipage/rendering.html#the-select-element-2
https://html.spec.whatwg.org/multipage/rendering.html#form-controls

I think we should at least have display:block in the spec (at least if option generates line breaks in innerText, so that is at least consistent).