Strange black outline on all S.O and on browsers - Microsoft Community
CSS Quick Tip: Using Outline - Pine
Sass 3.2: Silent Classes - Speaker Deck
アメブロ編集画面のアレンジ / 「outline」はブラウザデフォルトに | PersonWriter's Room
Don't Override CSS Outline Focus Styles
Copy the Browser's Native Focus Styles | onYou Developers Blog
How to remove outline in bootstrap 4 - Stack Overflow
WebKit focus ring color in Chrome browser | DebugAH
টুইটারে CSS-Tricks: "Copy the Browser's Native Focus Styles https://t.co/SHbck7s83j" / টুইটার
Chosen outline color on focus doesn't match browser default · Issue #1451 · harvesthq/chosen · GitHub
Copy the Browser's Native Focus Styles | CSS-Tricks - CSS-Tricks
Chromeのoutline autoをFirefoxで使いたい : (*x).b=z->a+y/c
各ブラウザごとのデフォルトのスタイルシート、user agent stylesheetのまとめ -Chrome, Safari, Firefox, Edge | コリス
What is -webkit-focus-ring-color? - Stack Overflow
フォーカスの「黒枠」の色を変更するには / 新しいのが良いか悪いか | PersonWriter's Room
Chromium Blog: Giving users and developers more control over focus
WebKit focus ring color in Chrome browser | DebugAH
Disabling orange focus outline around Bootstrap buttons in Electron - Stack Overflow
What is -webkit-focus-ring-color? - Stack Overflow
![BUG] Different Chromium -webkit-focus-ring-color for headless/headful · Issue #4810 · microsoft/playwright · GitHub](https://user-images.githubusercontent.com/52075362/102950241-d89b4a80-448f-11eb-9ce3-1cb92b63473d.png "BUG] Different Chromium -webkit-focus-ring-color for headless/headful · Issue #4810 · microsoft/playwright · GitHub")
BUG] Different Chromium -webkit-focus-ring-color for headless/headful · Issue #4810 · microsoft/playwright · GitHub
Stop Messing with the Browser's Default Focus outline
WebKit focus ring color in Chrome browser | DebugAH
Chrome: Black outline on :focus state on several UI elements · Issue #15113 · zulip/zulip · GitHub
