This post will show you how to turn off spell check in safari. You can also turn off auto-correcting using this method.
how to disable spellcheck in safari
open safari
click in a text box or text area (the addressbar will do)
goto edit > spelling and grammar
untick ‘check spelling while typing’ to get rid of the red underlines when you mis-spell words
untick ‘correct spelling automatically’ to stop safari from replacing words it thinks are incorrect.
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