Vim
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multiple buffers and tabs
Why not use tabs (introduced in Vim 7)? You can switch between tabs with :tabn and :tabp, With :tabe <filepath> you can add a new tab; and with a regular :q or :wq you close a tab. If you map :tabn and :tabp to your F7/F8 keys you can easily switch between files.
syntax highlight
:set syntax=html
find and replace
:%s/foo/bar/g
case insensitive search
You can use the \c escape sequence anywhere in the pattern. For example:
/\ccopyright or /copyright\c or even /copyri\cght