The CSS color violet under another name
#EE82EE is the code of the CSS keyword violet, which this site also lists as violet (web). The name lavender magenta comes from older versions of the Wikipedia article on lavender. A 2010 version shows it under the heading "Lavender magenta (web color violet)". Newer versions have dropped the section.
Why magenta and not violet
The red and blue values are the same, 238 each, with green at 130. On a screen, equal red and blue is the mark of a magenta tint. Real violet sits past blue at the end of the rainbow and looks much bluer, like electric violet. That is why the old article called the web keyword a light magenta and gave it this second name. Black text works well on it, at 9.06 to 1.

