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https://stackoverflow.com/questions/7337670/how-to-detect-focusin-support
But now I'm trying to "fix" browsers that don't support the focusin and focusout events. According to PPK, that's basically just Firefox. Unfortunately, Chrome and Safari are listed as having "incomplete" support, for the following reason: Safari and Chrome fire these events only with addEventListener; not with traditional registration.
https://gist.github.com/nuxodin/9250e56a3ce6c0446efa
Jun 05, 2019 · focusin focusout support for firefox. GitHub Gist: instantly share code, notes, and snippets.
https://developer.mozilla.org/en-US/docs/Web/API/Element/focusout_event
The focusout event fires when an element is about to lose focus. The main difference between this event and blur is that focusout bubbles while blur does not.. The opposite of focusout is focusin.
https://bugzilla.mozilla.org/show_bug.cgi?id=687787
The only > browser that have had focusin/focusout unimplemented for the last web eon is > Firefox. > > I don't know what browsers jQuery has to support these days but IE has had > the right focusin/focusout implementation at least since 5.5.
https://developer.mozilla.org/en-US/docs/Web/API/Element/focusin_event
Mar 31, 2019 · The focusin event fires when an element is about to receive focus. The main difference between this event and focus is that focusin bubbles while focus does not.. The opposite of focusin is focusout.
https://www.w3schools.com/jsref/event_onfocusin.asp
Tip: Although Firefox does not support the onfocusin event, you can find out whether a child of an element gets the focus or not, by using a capturing listener for the onfocus event (using the optional useCapture parameter of the addEventListener() method). Tip: The onfocusin event is the opposite of the onfocusout event.
https://api.jquery.com/focusin/
The focusin event is sent to an element when it, or any element inside of it, gains focus. This is distinct from the focus event in that it supports detecting the focus event on parent elements (in other words, it supports event bubbling). This event will likely be used together with the focusout event.
https://www.w3schools.com/jsref/event_onfocusout.asp
Tip: Although Firefox does not support the onfocusout event, you can find out whether a child of an element loses focus or not, by using a capturing listener for the onblur event (using the optional useCapture parameter of the addEventListener() method). Tip: The onfocusout event is the opposite of the onfocusin event.
https://javascript.info/focus-blur
They do not bubble. Can use capturing state instead or focusin/focusout. Most elements do not support focus by default. Use tabindex to make anything focusable. The current focused element is available as document.activeElement.
http://www.quirksmode.org/dom/events/blurfocus.html
blur Fires when a focusable element loses the focus focusin and focusout Fire at the same time as focus and blur, but bubble. That sounds simple, but it isn’t. The reason focus and blur don’t bubble is that the events mean something quite different on the window and on any other focusable element.
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