良い一日！
専門家グループから私はこれらの答えを得た。私は英語で回答しておきます。
Is web safe color identification really important? Is it still relevant?
and:
Question (just to get it right): "what the hell is a web-safe color?" I mean, I know, what it is, but is absolute obsolete these times.
Web-safe colors have ben "invented" or better said have been defined by some OS manufacturers many years (about 2 decades) ago. The reason was that Windows, Mac and Unix systems had different definitions of the RBG gamut. This resulted in different colors when rendering the same values on different OS.
So the comitee defined a bunch of (I think 216 out of the 256 color gamut) colors, associated with names that schould be displayed "quite similar" on every OS.
But since many years the graphic cards can display 8bpc RGB = 16.7 million colors (even cheap smartphones use a 65k color gamut) - including all the 216 and 256 colors of older definitions. But the best: all the color values will render consistent on every OS. (So, if the monitors are calibrated, the color on an iOS will be the same, displayed by a graphic card running under Windows.)
This means: there is literately no restriction of the use of (many more than 216) colors on the web. "Web-safe" colors are unnecessary.
P.S.: when I teach people graphic design or photoshop, they ask me about that icon for the web-safe color restriction in the colorpicker. This makes me laughing: we are talking about if we use sRGB, AdobeRGB or WideGamutRGB, cieRGB or L*RGB - and you ask me to reduce the use of colors in my designs to 216 ? You are kidding!
and:
Web-safe colors might technically have become irrelevant, but a panel with some easy-to-pick swatches still has its benefits.
Just like Illustrator and Photoshop, which whip up a bunch of swatches to initiate color picking, DW might also adhere to this well-know preset of colors. They are nice to distinguish (not too subtle to show differences), easy to understand (each gradation is 20 percent), quickly to recognize (the hex notation has this 00 33 66 99 CC FF pattern) and the RGB values are engraved in every seasoned web designer’s mind (0, 51, 102, 153, 204, 255). The resulting matrix of 216 colors (6 x 6 x 6) gradations is still strong enough to serve as a jump-start swatch collection.
So, I’d be happy to spot such a panel back in Dreamweaver.
私は文が有用であることを願っています。
Hans-Günter