Using formal language doesn't mean that you have to sound stilted and boring. You can still sound lively and engaging by using words imaginatively but choosing carefully to avoid slang and incorrect grammar. News reports use formal language, but the words are rich and stimulating to keep the audience interested. BBC Bitesize
... Editorial policies dictate the use of adjectives, euphemisms, and idioms. Newspapers with an international audience, for example, tend to use a more formal style of writing. Wikipedia
Formal English is used in “serious” texts and situations — for example, in official documents, books, news reports, articles, business letters or official speeches ... antimoon
Despite the above, I noticed news websites are using some Informal English words and style within their article content.
... But now she's decided to go a step ... BBC
... They laid into the Senate committee with a vigor that Brennan ... The Guardian
The 7.8-magnitude quake, which struck Saturday night ... CNN
So, my question: Have the informal words (and style) that are being used by newspapers become more formal in modern language? Or have the newspapers started using informal language in their content?