MS Word
Shimmer, Sparkle text, Blinking Background etc are known as

Font effects
Text effects
Word art
Font styles

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MS Word
If you need to double underline a word, how will you do that?

Go to Format menu and then Font option. Open Underline Style and choose Double Underline
From Format menu choose Font option and then from Font tab open Underline Style and select Double Underline
Select the text then choose Format > Font and on Font tab, open Underline Style and choose Double Underline
Click double underline tool on formatting toolbar

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