Can Espruino handle timing of WS2811 - YES

Timing from datasheets WS2812.pdf, WS2811.pdf

Signal     WS2812-800KHz    WS2811-400KHz    WS2811-800KHz

T0H_NS      350              500              250
T0L_NS      800              2000             1000

T1H_NS      700              1200             600
T1L_NS      600              1300             650             

Tolerance is +-150ns

Coded in Espruino:

Signal     ESP32

T0H_NS      350       
T0L_NS      900 

T1H_NS      900   
T1L_NS      350 

Now testing some WS2812 and WS2811 with this setting:

Signal     ESP32

T0H_NS      350       
T0L_NS      900 

T1H_NS      700   
T1L_NS      600