object-fit and object-position can solve the problem of deformed and improper cropping of pictures or videos in web pages. 1. object-fit controls the filling method. Common values ??include fill (stretch fill), contain (keep the full display of proportion), cover (keep the proportion cover container), none (original size) and scale-down (suitable for dynamic content); 2. object-position controls the position of the crop area, and the syntax is similar to background-position, which can be used to specify visual focus; 3. Actual applications include mobile avatar cropping, card-style layout unified display, video embedding adaptation and other scenarios; 4. Pay attention to browser compatibility and test the effects of different proportions of pictures to ensure that key parts are not cropped. Mastering these two attributes can improve the performance control of media elements in different containers.

If you encounter problems with layout deformation and improper cropping when processing pictures or videos on a web page, it is likely that it is useless for object-fit and object-position . Although these two CSS attributes look inconspicuous, they can greatly improve the performance control of media elements in different containers.

object-fit: controls how media is filled

When you put an image into a container of fixed size, the image may be stretched or misaligned. At this time object-fit comes in handy.

It has several commonly used values:

• fill : default value, fills the entire container, regardless of the scale, may be deformed
• contain : Keep scaled to ensure that the entire picture is displayed and the container may be white
• cover : Keep scaled to ensure that the entire container is covered and the image may be cropped
• none : original size, no zoom
• scale-down : similar contain , but the smaller one shall prevail (suitable for dynamic content)

For example, if you put a horizontal picture in a 300x200 div, if you use object-fit: cover , the picture will be centered and cropped, which is suitable for the cover picture display; while using contain , the entire picture will be fully displayed in the box, which is suitable for the album preview scene.

object-position: controls the position of the crop area

When using object-fit: cover or none , the image may be cropped. So do you want to decide where to start laying? This is what object-position does.

Its syntax is similar to background-position, such as:

• object-position: center; (default)
• object-position: top left;
• object-position: 50% 30%;
• object-position: 10px 20px;

If you have a close-up picture of a character that you want to always display with the face as the center, and even if the container scale changes, the head will not be cut off, you can use it in conjunction with object-fit: cover and object-position: center top .

This property is especially useful in responsive design, especially when it is necessary to emphasize a specific visual focus.

Practical application suggestions

In actual development, the following points are worth noting:

• Mobile avatar cropping : Use cover position to keep uploaded pictures always focused in the specified area.
• Unified display of card-style layout pictures : set up a unified width and height container and cover to ensure neat visuals.
• Video Embedding Adaptation : Like pictures, the video tag can also use these two attributes to control the playback area.
• Pay attention to browser compatibility : mainstream modern browsers support it, but the old version of IE cannot.

In addition, don't forget to test the effect of images of different proportions in the container to avoid excessive blank spaces or critical parts being cropped.

Basically that's it. Mastering object-fit and object-position allows you to more flexibly control the performance of media elements in various layouts, and the code is also concise and clear.

The above is the detailed content of Mastering CSS Object-fit and Object-position for media. For more information, please follow other related articles on the PHP Chinese website!