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To modify the content of an element, you can use the _____________ property. This property allows you to change the text content of an element. For example, let's say we have an element with the id 'myElement' and we want to change its text content to 'Hello, world!'. Here's how you can do it:

1const element = document.getElementById('myElement');
2element.textContent = 'Hello, world!';

Additionally, you can modify the style of an element by accessing the _____________ property. This property allows you to change the CSS properties of an element. For example, if you want to change the background color and font size of an element, you can do so as follows:

1const element = document.getElementById('myElement');
2element.style.backgroundColor = 'red';
3element.style.fontSize = '24px';

With these techniques, you can dynamically modify the content, style, and attributes of HTML elements to create dynamic and interactive web pages.