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The view-source URI scheme is used by some web browsers to construct URIs that result in the browser displaying the source code of a web page or other web resource.[1]
For example, the URI view-source:https://example.com should show the source of the page located at https://example.com.
In the early Internet, the View Source technique helped people learn by example to create their own web pages.[2]
On 25 May 2011, the 'view-source' URI scheme was officially registered with IANA[3] per RFC 4395.
Firefox and Internet Explorer both supported the scheme, but support was dropped from Internet Explorer in Windows XP SP2 due to security problems.[4] Firefox also suffered a similar security issue (by combining view-source and JavaScript URIs[5]), but still supported it in Firefox 1.5[6] after being fixed. In 2009, a new discovered bug was fixed in Firefox 3.0.9.[7]
| Browser | Supported? |
|---|---|
| Mozilla Firefox | supported[8] |
| SeaMonkey | supported |
| Netscape | supported |
| Internet Explorer 4, 5 and 6 | supported |
| Internet Explorer 6, 7, and 8 | not supported after Windows XP SP2 |
| Safari 3.2.1 | supported |
| Safari 5, 6 | not supported |
| Opera 7, 8, 9, 10, 11 | not supported |
| Opera 15 and up | supported |
| Google Chrome | supported[9] |
| Web | supported |
| HP webOS | via third-party app (Internalz Pro)[10] |
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