WordPress uses a combination of PHP, HTML and CSS to render the appearance of a blog. If the CSS contains invalid code, the blog will fail to display as intended, as the Web browser won't understand ...

Google's John Mueller confirmed on Twitter that it may be worth looking into compressing your HTML and CSS. He said "Sometimes minifying HTML & CSS can reduce the size of the files, so it can ...

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Cascading Style Sheets (CSS) level 3, also known as CSS3, introduces multiple background images support. You can list multiple background images, separating each with a comma, and set how they display ...