Then, when we have the reference, we can change its text (via. JavaScript allows us to reach into the DOM and pull out the reference to the hidden span node the node may not be visible in the render tree, but it's still there in the DOM. LoadTime.textContent = 'You loaded this page on: ' + new Date() Var loadTime = document.createElement('div') create a new element, style it, and append it to the DOM Span.textContent = 'interactive' // change DOM text content Var span = document.getElementsByTagName('span') To illustrate this, let's augment our previous 'Hello World' example with a simple inline script: JavaScript is a dynamic language that runs in a browser and allows us to alter just about every aspect of how the page behaves: we can modify content by adding and removing elements from the DOM tree we can modify the CSSOM properties of each element we can handle user input and much more. JavaScript blocks DOM construction unless explicitly declared as async.JavaScript execution blocks on the CSSOM.JavaScript can query and modify the DOM and the CSSOM.Performance, make your JavaScript async and eliminate any unnecessary JavaScript However, JavaScript can alsoР”В«lock DOM construction and delay when the page is rendered. Styling, and its response to user interaction. JavaScript allows us to modify just about every aspect of the page: content, Ilya is a Developer Advocate and Web Perf Guru

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