You should save this file for future reference. Just click on File, Save as, and choose the directory where you are keeping all your HTML code, make sure the file type is HTML, and type in the name colours.html Most browsers seem to agree on the following sixteen colour names
black	maroon	red	purple
fuchsia	green	blue	navy
silver	gray	white	lime
olive	yellow	teal	aqua

The following colours are safe to use with all browsers.
000000	003300	006600	009900	00CC00	00FF00
330000	333300	336600	339900	33CC00	33FF00
660000	663300	666600	669900	66CC00	66FF00
990000	993300	996600	999900	99CC00	99FF00
CC0000	CC3300	CC6600	CC9900	CCCC00	CCFF00
FF0000	FF3300	FF6600	FF9900	FFCC00	FFFF00
000033	003333	006633	009933	00CC33	00FF33
330033	333333	336633	339933	33CC33	33FF33
660033	663333	666633	669933	66CC33	66FF33
990033	993333	996633	999933	99CC33	99FF33
CC0033	CC3333	CC6633	CC9933	CCCC33	CCFF33
FF0033	FF3333	FF6633	FF9933	FFCC33	FFFF33
000066	003366	006666	009966	00CC66	00FF66
330066	333366	336666	339966	33CC66	33FF66
660066	663366	666666	669966	66CC66	66FF66
990066	993366	996666	999966	99CC66	99FF66
CC0066	CC3366	CC6666	CC9966	CCCC66	CCFF66
FF0066	FF3366	FF6666	FF9966	FFCC66	FFFF66
000099	003399	006699	009999	00CC99	00FF99
330099	333399	336699	339999	33CC99	33FF99
660099	663399	666699	669999	66CC99	66FF99
990099	993399	996699	999999	99CC99	99FF99
CC0099	CC3399	CC6699	CC9999	CCCC99	CCFF99
FF0099	FF3399	FF6699	FF9999	FFCC99	FFFF99
0000CC	0033CC	0066CC	0099CC	00CCCC	00FFCC
3300CC	3333CC	3366CC	3399CC	33CCCC	33FFCC
6600CC	6633CC	6666CC	6699CC	66CCCC	66FFCC
9900CC	9933CC	9966CC	9999CC	99CCCC	99FFCC
CC00CC	CC33CC	CC66CC	CC99CC	CCCCCC	CCFFCC
FF00CC	FF33CC	FF66CC	FF99CC	FFCCCC	FFFFCC
0000FF	0033FF	0066FF	0099FF	00CCFF	00FFFF
3300FF	3333FF	3366FF	3399FF	33CCFF	33FFFF
6600FF	6633FF	6666FF	6699FF	66CCFF	66FFFF
9900FF	9933FF	9966FF	9999FF	99CCFF	99FFFF
CC00FF	CC33FF	CC66FF	CC99FF	CCCCFF	CCFFFF
FF00FF	FF33FF	FF66FF	FF99FF	FFCCFF	FFFFFF