el	tabIndex	Click to try to focus (1 s delay)	Programmatically focusable? (click button below)
input[hidden]
button
button[disabled]
button[hidden]
select
option
select multiple
select multiple option
optgroup
select multiple optgroup
textarea
checkbox
input[type=time]
a
a[href]
link
link[href]
details details contents
summary inside details details contents
second summary inside details second summary details contents
summary by itself
iframe
iframe src
object
object data
embed
embed src
span
span[tabindex=""]
span[tabindex="0"]
span[contenteditable]
button[tabindex="-1"]
Shadow root with delegates focus
text1 text2 text3 text4
span[tabindex="-1"]
img
img src
video
video[src]
audio
audio[src]
area with href (red box)
area with no href (hole in red box)

Active element (updates every 100 ms):

Try to find out programmatic focusability