Iframe to only show a certain part of the page

problem ：

I am working on iframes, and I need to show a certain portion of the page [say, the top right ] in an iframe with about 300px width and 150px height. I am iframe To work on , I need a width of about 300px, The height is 150px Of iframe Some parts of the page are displayed in （ For example, the upper right corner ）.

Example: example ：

Say I wanted to put an iframe of www.mywebsite.com/portfolio.php on a page, but have the iframe sized to only show the " portfolio-sports " section at the top right . Suppose I want to place a www.mywebsite.com/portfolio.php Of iframe , But it's time to iframe The size of can only be upper right Show “ portfolio-sports ” part .

How can I achieve this ? How can I achieve ？

Thanks. thank you .

EDIT : DEMO edit ： demonstration

[ Thanks to Pointy ][ thank Pointy]

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Solution ：

Reference resources ： https://stackoom.com/en/question/DjDL