June 1999
Intermediate to advanced
540 pages
21h 39m
English
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JavaScript Security Restrictions
For security reasons, there are restrictions on the tasks that untrusted JavaScript code can perform. In Navigator 4, signed scripts can circumvent these restrictions by requesting certain privileges:
- Same origin policy
Scripts can read only properties of windows and documents that were loaded from the same web server unless they have UniversalBrowserRead.
- User’s browsing history
Scripts cannot read the array of URLs from the History object without UniversalBrowserRead.
- File uploads
Scripts cannot set the value property of the FileUpload form element without UniversalBrowserRead.
- Sending email and posting news
Scripts cannot submit forms to a
mailto:or news: URL without user confirmation or UniversalSendMail.- Closing windows
A script can close only browser windows that it created, unless it gets user confirmation or has UniversalBrowserWrite.
- Snooping in the cache
A script cannot load any
about:URLs, such as about:cache, without UniversalBrowserRead.- Hidden windows and window decorations
A script cannot create small or offscreen windows or windows without a titlebar, and cannot show or hide window decorations without UniversalBrowserWrite.
- Intercepting or spoofing events
A script cannot capture events from windows or documents from a different server and cannot set the fields of an Event object without UniversalBrowserWrite.
- Reading and setting preferences
A script cannot read or write user preferences using Navigator.preference() without UniversalPreferencesRead ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.