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This feature of CSP would have effectively allowed any add-on, extension, or Bookmarklet to inject script into web sites, regardless of the origin of that script, and thus be exempt from CSP policies. However, this policy has since been modified (as of CSP 1.1 [29]) with the following wording. Note the use of the word "may" instead of the prior ...
In the early part of the century, practices such as browser sniffing were deemed unusable for cross-browser scripting. [2] The term "multi-browser" was coined to describe applications that relied on browser sniffing or made otherwise invalid assumptions about run-time environments, which at the time were almost invariably Web browsers.
In computing, the same-origin policy (SOP) is a concept in the web-app application security model. Under the policy, a web browser permits scripts contained in a first web page to access data in a second web page, but only if both web pages have the same origin. An origin is defined as a combination of URI scheme, host name, and port number.
The Browser Object Model (BOM) is a browser-specific convention referring to all the objects exposed by the web browser. [1] Unlike the Document Object Model, there is no standard for implementation and no strict definition, so browser vendors are free to implement the BOM in any way they wish.
Though most polyfills target out-of-date browsers, some exist to simply push modern browsers forward a little bit more. Lea Verou's -prefix-free polyfill is such a polyfill, allowing current browsers to recognise the unprefixed versions of several CSS3 properties instead of requiring the developer to write out all the vendor prefixes.
JavaScript is an event-based imperative programming language (as opposed to HTML's declarative language model) that is used to transform a static HTML page into a dynamic interface. JavaScript code can use the Document Object Model (DOM), provided by the HTML standard, to manipulate a web page in response to events, like user input.
Previously, JavaScript only supported function scoping using the keyword var, but ECMAScript 2015 added the keywords let and const, allowing JavaScript to support both block scoping and function scoping. JavaScript supports automatic semicolon insertion, meaning that semicolons that normally terminate a statement in C may be omitted in ...
To demonstrate specificity Inheritance Inheritance is a key feature in CSS; it relies on the ancestor-descendant relationship to operate. Inheritance is the mechanism by which properties are applied not only to a specified element but also to its descendants. Inheritance relies on the document tree, which is the hierarchy of XHTML elements in a page based on nesting. Descendant elements may ...