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Deprecated patterns that warned in 0.12 no longer work, ref resolution order has changed, Removed properties this._pendingState and this._rootNodeID, Support ES6 classes, Added API React.findDOMNode(component), Support for iterators and immutable-js sequences, Added new features React.addons.createFragment, deprecated React.addons.classSet. 15.0.0
Form, link and image elements could be referenced with a hierarchical name that began with the root document object. A hierarchical name could make use of either the names or the sequential index of the traversed elements. For example, a form input element could be accessed as either document.myForm.myInput or document.forms[0].elements[0].
Deprecated elements will be dropped altogether: acronym, applet, basefont, big, center, dir, font, frame, frameset, isindex, noframes, strike, tt W3C Working Group publishes "HTML5 differences from HTML 4", [ 130 ] which provides a complete outline of additions, removals and changes between HTML5 and HTML4.
Most presentational markup elements have become deprecated under the HTML 4.0 specification in favor of using CSS for styling. Hypertext markup makes parts of a document into links to other documents An anchor element creates a hyperlink in the document and its href attribute sets the link's target URL .
Presentational elements were not formally deprecated in HTML 4.01 and XHTML recommendations, but were recommended against. In HTML 5, some of those elements, such as <i> and <b>, are still specified as their meaning has been clearly defined "as to be stylistically offset from the normal prose without conveying any extra importance". [8] [9]
Deprecation is the discouragement of use of something human-made, such as a term, feature, design, or practice. Typically something is deprecated because it is claimed to be inferior compared to other options available. Something may be deprecated when it cannot be controlled, [clarification needed] such as a term. Even when it can be ...
In practice, the default display of the elements can be changed by the use of Cascading Style Sheets (CSS), ... HTML5 introduced several new elements; ...
Modern frameworks, such as React 18 and Vue 3, address these challenges with features like concurrent rendering, tree-shaking, and selective hydration. While these advancements improve rendering efficiency and resource management, their benefits depend on the specific application and implementation context.