Which attribute is used to specify the height of an <iframe> in HTML?heightsizeframestyle

The attribute used to specify the height of an <iframe> in HTML is the height attribute. You can also use CSS to set the height by applying styles through the style attribute.

Here’s how to use both methods:

1. Using the height attribute:

   <iframe src="url" height="400"></iframe>
   

   In this example, the height of the <iframe> is set to 400 pixels.

2. Using the style attribute:

   <iframe src="url" style="height: 400px;"></iframe>
   

   Here, the height is also set to 400 pixels, but it's done using inline CSS.

Both methods are valid, but using CSS is generally preferred for better styling control across different devices and screen sizes.