Sometime certain words typed into an input type text box, is shown with a red underline on the browser indicating that the word could be grammatically incorrect.
How do I prevent this from showing up?
Sometime certain words typed into an input type text box, is shown with a red underline on the browser indicating that the word could be grammatically incorrect.
How do I prevent this from showing up?
Spellcheckers in browsers are a nonstandard feature. Some come with the OS, some are browser specific plugins. I doubt there's a common way to turn them off, if there's one at all.
The bigger problem is that the attitude of controlling every last bit of the experience doesn't work very well on the web. There are a virtually infinite number of ways how a website can be consumed. You simply can't control every last aspect of it. Spellchecking is one of the things users enable for themselves because they like it. They are used to getting red lines here and there. Maybe they have added those words to their dictionary. Maybe the red line in itself is a useful check for them. You have no business meddling with this choice.
You control your page up to the HTML, CSS and Javascript you serve. However the user chooses to further enhance the site using plugins, features or specific browsers is not up to you.