Is it WebKit? Presto? Is V8 engine dedicated to Chrome alone?
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WebKit and Presto are not Javascript engines, but rendering engines. Opera previously used a Javascript engine called "Carakan", but have since started transitioning from Presto and Carakan to Blink and V8.

SBI
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oh..yeah. So we can say that Webkit and V8 are the current rendering engines in opera12/Opera next? – Smitha Jun 25 '13 at 07:00
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Yes, all versions after 12.15 use the Blink engine in combination with V8. – SBI Jun 25 '13 at 07:03
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okay..thanks! Any links which can provide me the exact info on it? – Smitha Jun 25 '13 at 08:33
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Wikipedia seems to be your best stop. Such as: http://en.wikipedia.org/wiki/History_of_the_Opera_web_browser#Version_15 – SBI Jun 25 '13 at 08:38
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1Note Opera 14 for Android is WebKit (it's based on a pre-fork version of the Chromium Content API). – gsnedders Jun 25 '13 at 17:25
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Is this is why Opera's dev tool look almost identical to Chrome's? Due to V8? – Gil Epshtain May 17 '18 at 22:42
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As per wikipedia:
It remained in use until Opera 12.15, when the browser's developer Opera Software ASA began phasing Presto out of its products in favor of the WebKit layout engine and V8 JavaScript engine combined with a modified Chromium browser.
For more , you can go through Web specifications support in Opera Presto 2.12.