Dandelion

#fedf08

A yellow that is saturated. It is very light — it works as a page background, not as text.

Hex

#fedf08

RGB

254, 223, 8

OKLCh

90.2% 0.186 99.0°

CIELAB (D50)

89.4, -1.3, 87.1

What is true of this colour, and of no other

29 other named colours sit within ΔE00 2 of it — this part of the space is crowded, and the names here are finer distinctions than most people make.
It sits exactly on the sRGB boundary: at this lightness and hue the gamut has nothing left, and a wider display would show a more colourful version of it.
As text on white it measures APCA Lc 16.1; on black, Lc -87.6. The sign is the polarity, which the WCAG ratio discards.
Built into an eleven-step scale, 10 of the 10 adjacent pairs stay ΔE00 2 apart — see the ramp.
protanopia and deuteranopia and tritanopia shift it by ΔE00 7.2 and 7.1 and 7.4 — no red cone.

Text on this colour

White text

1.33:1 — fails AA

Black text

15.77:1 — passes AA

Black text is the better of the two at15.77:1. That is enough for body text.

As text on white, it needs to change

#887700 is the nearest colour of the same hue that passes AA on white, at 4.50:1. Only the lightness moved, and some saturation was given up to stay inside sRGB.

Try it against your own background

The same colour, with one cone missing

As you see it

#fedf08

protanopia

#e3e30b · ΔE00 7.2

deuteranopia

#e9e900 · ΔE00 7.1

tritanopia

#efef00 · ΔE00 7.4

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isTibetan Yellow at ΔE00 0.127: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.

Tibetan YellowΔE00 0.127 · #fedf00
Golden YellowΔE00 0.263 · #ffdf00
Sun YellowΔE00 0.75 · #ffdf22
Dallol YellowΔE00 0.759 · #fddc00
Super SaiyanΔE00 0.783 · #ffdd00
GingerlineΔE00 0.852 · #ffdd11
Isle of SandΔE00 0.943 · #f9dd13
JubilationΔE00 1.032 · #fbdd24
Crypto GoldΔE00 1.042 · #ffe314
Summer SunΔE00 1.083 · #ffdc00
Vivid YellowΔE00 1.094 · #ffe302
Down on the Sunflower ValleyΔE00 1.143 · #ffdf2b

11 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.