Google has been trying to steer webmasters away from dynamically serving webpages as it makes it harder to index content, there can be duplicate content issues, and there’s always a potential spam issue. And it is becoming somewhat outdated for many usages that webmasters were previously using it for, although it is still used for things such as serving location specific content based on a visitor’s IP address.
2. For CSS, you can use different media queries to download the right CSS file.
3. For images, you can use the <picture> element or srcset attributes as described here: http://responsiveimages.org . Granted browser support is not 100% yet, but it’s quickly coming along, so prepare to benefit from this soon!
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