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The first web browsers were monolithic programs, but browser developers soon adopted a modular approach, splitting browsers into several large components:
Some layout engines may begin rendering before all of a page's resources are received. This can result in visual changes as more data is received, such as images being gradually filled in or a flash of unstyled content if rendering begins before formatting information is received.
KDE created the KHTML engine for use in its Konqueror browser. Apple forked KHTML make the WebKit engine for its Safari browser. Google originally used WebKit for its Chrome browser but now uses its own fork called Blink. The Opera browser also uses Blink; previously, it used its own Presto engine.
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