How to apply CSS to iframe?

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You can apply CSS styles to an <iframe> element by targeting the <iframe> itself or by targeting the content within the <iframe> if it comes from the same domain. Here, I'll provide examples for both scenarios.

Styling the <iframe> Element:

To style the <iframe> element itself, you can use CSS to set properties such as width, height, border, and so on. Here's an example:

html
<!DOCTYPE html>
<html>
<head>
    <style>
        /* Style the iframe element */
        iframe {
            width: 500px;
            height: 300px;
            border: 2px solid #007bff;
        }
    </style>
</head>
<body>
    <iframe src="https://example.com"></iframe>
</body>
</html>

In this example, we use CSS to set the width, height, and border of the <iframe> element.

Styling the Content within the <iframe> (Same Domain):

If the content within the <iframe> comes from the same domain as your main page, you can use JavaScript to access and modify the content's CSS. Here's an example:

html
<!DOCTYPE html>
<html>
<head>
    <style>
        /* Style the iframe element */
        iframe {
            width: 500px;
            height: 300px;
        }
    </style>
    <script>
        // Access the iframe content and apply CSS to elements within it
        function applyCSS() {
            var iframe = document.getElementById("myIframe");
            if (iframe) {
                var iframeDocument = iframe.contentDocument || iframe.contentWindow.document;
                var targetElement = iframeDocument.getElementById("exampleDiv");
                if (targetElement) {
                    targetElement.style.backgroundColor = "#ffcc00";
                    targetElement.style.color = "#333";
                }
            }
        }
    </script>
</head>
<body>
    <iframe id="myIframe" src="https://example.com"></iframe>
    <button onclick="applyCSS()">Apply CSS to Content</button>
</body>
</html>

In this example, we have an <iframe> element with an id of "myIframe" and a button. When you click the button, the JavaScript function applyCSS() accesses the content within the <iframe> and applies CSS styles to a specific element with an id of "exampleDiv." This is done by accessing the contentDocument property of the <iframe> and then manipulating the CSS properties of the target element within it.

Please note that for security reasons, you can only access and modify the content of an <iframe> if it's from the same domain as your main page. Cross-origin restrictions apply if the content comes from a different domain.

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