General Information
This is not even relevant, but I will give general information.
Google Chrome was created by Google, has a layout engine of WebKit, and the latest version is 26.0.1410.43.
Internet Explorer was made by Microsoft and Spyglass, is free only with a legal Windows license, has a layout engine of Trident, and the latest version is 10.0.3.
Mozilla Firefox was created by the Mozilla Foundation, has a layout engine of Gecko, and the latest version is Firefox 19.0.2.
Opera was created by Opera Software, has a layout engine of Presto until 12.14, and the latest release version is Opera 12.14, where the layout engine is WebKit.
Safari was created by Apple, has a layout engine of WebKit, and the latest version is 6.0.3.
Security
According to Secunia...
Chrome 25 has no critical vulnerabilities.
IE 10 has no critical vulnerabilities, but who uses IE 10? People use IE8 and IE9, and IE8 has 1 barely critical plus 7 non-critical, and IE9 has non-critical vulnerabilities (1) but still has vulnerabilities.
Firefox 19, Opera 12, and Safari 6 have no critical vulnerabilities.
Acid Test Scores
All passed the Acid1 on time, but when the Acid2 test came, it was a disaster for some browsers.
Internet Explorer 7 was did not pass, and when it didn't, Microsoft responded that the Acid2 test was more of a "wish list" of features than an actual web standards test. Microsoft then announced to the public that IE8 would pass, but the settings needed to pass were not turned on by default, so IE8 wouldn't pass the test eventually. They said so as not to make webpages have problems because they expected IE's (sucking!) old, non-compliant behavior. However, when IE8 Beta 1 came out, they did turn on the settings by default. However, it had an issue IE8 Beta 2 solved.
A timeline of Acid2 passers are available. Safari (privately) passed first, then iCab, then Konqueror. Then, iCab passed publicly, and Safari passed again with source code available. Finally Safari 2.0.2 really passed, making it the first officially released browser to do so. Konqueror 3.5 passed a month later, Prince 5.1 did a few days after Konqueror, and finally Opera 9 Dev passed in 2006. It was a public weekly build. Konqueror 3.5.2 correctly rendered it (previously, it was not but Konqueror passed anyway). Firefox, on April 11, 2006, passed and so (public nightly build). Then a private build of Opera Mobile for the Symbian OS passed, making it the first mobile browser to do so. OmniWeb 5.5 beta 1 passed as a public build, making it the second WebKit browser to do so (after Safari). Opera 9.0 passed about a month before OmniWeb, and Obigo passed on Independence Day. iCab 3.0.3 finally correctly rendered it (same case as Konqueror). It went so on, and the last major browser to do so was IE8, on March 19, 2009. Google Chrome passed Dec 11, 2008 but Chrome was released in 2008.
Acid3 was hard for some browsers. WebKit rose from 60 to 87 in less than a month, dramatically being so great.
By the end of March 2008, development versions using the Presto and WebKit layout engines passed well. Opera and Safari were to pass first.
Then, Chrome 2.0 got a score of 100/100, but did not render the page correctly. New release versions of Chrome 2.0 passed later in the year.
Firefox and IE suffered.
Firefox 3 was focusing on stability rather than Acid3 success. As a result, Firefox 3 scored 71/100. Firefox 3.5 scored 93/100, Firefox 3.6 scored 94/100, and Firefox 4 scored 97/100 because it did not support SVG (Scalable Vector Graphics) fonts. They were removed from Acid3, allowing Firefox 4 to pass.
IE very much suffered. Microsoft (god!) kept making excuses that Acid3 was like a wish list. IE8 scored 20/100, worse than all relevant browsers at the time. IE needed 4 times and Firefox needed 3 times.
Criticism was made, especially by Mozilla and Microsoft.
A timeline of Acid2 passers are available. Safari (privately) passed first, then iCab, then Konqueror. Then, iCab passed publicly, and Safari passed again with source code available. Finally Safari 2.0.2 really passed, making it the first officially released browser to do so. Konqueror 3.5 passed a month later, Prince 5.1 did a few days after Konqueror, and finally Opera 9 Dev passed in 2006. It was a public weekly build. Konqueror 3.5.2 correctly rendered it (previously, it was not but Konqueror passed anyway). Firefox, on April 11, 2006, passed and so (public nightly build). Then a private build of Opera Mobile for the Symbian OS passed, making it the first mobile browser to do so. OmniWeb 5.5 beta 1 passed as a public build, making it the second WebKit browser to do so (after Safari). Opera 9.0 passed about a month before OmniWeb, and Obigo passed on Independence Day. iCab 3.0.3 finally correctly rendered it (same case as Konqueror). It went so on, and the last major browser to do so was IE8, on March 19, 2009. Google Chrome passed Dec 11, 2008 but Chrome was released in 2008.
Acid3 was hard for some browsers. WebKit rose from 60 to 87 in less than a month, dramatically being so great.
By the end of March 2008, development versions using the Presto and WebKit layout engines passed well. Opera and Safari were to pass first.
Then, Chrome 2.0 got a score of 100/100, but did not render the page correctly. New release versions of Chrome 2.0 passed later in the year.
Firefox and IE suffered.
Firefox 3 was focusing on stability rather than Acid3 success. As a result, Firefox 3 scored 71/100. Firefox 3.5 scored 93/100, Firefox 3.6 scored 94/100, and Firefox 4 scored 97/100 because it did not support SVG (Scalable Vector Graphics) fonts. They were removed from Acid3, allowing Firefox 4 to pass.
IE very much suffered. Microsoft (god!) kept making excuses that Acid3 was like a wish list. IE8 scored 20/100, worse than all relevant browsers at the time. IE needed 4 times and Firefox needed 3 times.
Criticism was made, especially by Mozilla and Microsoft.
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