I’ve tried different things and it seems that on mobile you currently have no chance to do this in a proper way.
According to Safari Developer Docs there is support https://developer.apple.com/library/safari/documentation/AppleApplications/Reference/SafariHTMLRef/Articles/Attributes.html but it seems that this is more related to the Desktop Safari than iOS.
Additionally, spellcheck could do it but currently, according to http://caniuse.com/#feat=spellcheck-attribute :
The partial support in mobile browsers results from their OS generally
having built-in spell checking instead of using the wavy underline to
indicate misspelled words. spellcheck=”false” does not seem to have
any effect in these browsers.