Add inline CSS to the <html> element using TypeScript when clicked on

My experience with TypeScript is still new, and I recently found myself confused when trying to apply inline CSS to a tag on click. I initially thought it would be simple, but in TypeScript, things seem to work differently. I attempted to use 

document.querySelector("html").style.background = "blue"
, but encountered an error:

 Object is possibly 'null'.  TS2531

       jumpToRelativePosition(anchors['chapter-main'], anchors['chapter-next']);
      document.querySelector("html").style.background = "blue

"
        ^

I am seeking assistance to resolve this issue.

Thank you in advance.

javascripthtmlcsstypescript

Answer №1

When requiring access to DOM Elements, it is essential to specify what type of element they are. An HTMlElement encompasses all HTML element types.

const x = document.querySelector("html") as HTMLElement

If you declare the current element, such as an input element marked in TypeScript as HTMLInputElement.

EDIT: Remember to add "DOM" in your lib options in your tsconfig.json file

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