What is the difference between html5 and html4

Using this feature should enhance the user experience compared to focusing the element with script as the user can turn it off if the user does not like it, for instance.

A new placeholder attribute can be specified on the input and textarea elements. It represents a hint intended to aid the user with data entry. The placeholder attribute should not be used as a replacement for the label element. These elements can now be placed anywhere on a page, not just as descendants of the form element, and still be associated with a form. The new required attribute applies to input except when the type attribute is hidden , image or some button type such as submit , select and textarea.

It indicates that the user has to fill in a value in order to submit the form. For select , the first option element has to be a placeholder with an empty value. The input element has several new attributes to specify constraints: autocomplete , min , max , multiple , pattern and step. As mentioned before it also has a new list attribute which can be used together with the datalist element.

The input and textarea elements have a new attribute named dirname that causes the directionality of the control as set by the user to be submitted as well. The textarea element also has three new attributes, maxlength , minlength and wrap which control max input length and submitted line wrapping behavior, respectively. The form element has a novalidate attribute that can be used to disable form validation submission i.

The input and button elements have formaction , formenctype , formmethod , formnovalidate , and formtarget as new attributes. If present, they override the action , enctype , method , novalidate , and target attributes on the form element.

The input element also has the new minlength attribute. The script element has a new attribute called async that influences script loading and execution. The html element has a new attribute called manifest that points to an application cache manifest used in conjunction with the API for offline Web applications. The link element has a new attribute called sizes. It can be used in conjunction with the icon relationship set through the rel attribute; can be used for e. The ol element has a new attribute called reversed.

When present, it indicates that the list order is descending. The iframe element has new attributes called sandbox and srcdoc which allow for sandboxing content, e. The object element has a new attribute called typemustmatch which allows safer embedding of external resources. The img element has a new attribute called crossorigin to use CORS in the fetch and if it is successful, allows the image data to be read with the canvas API.

Several attributes from HTML4 now apply to all elements. These are called global attributes: accesskey , class , dir , id , lang , style , tabindex and title. The contenteditable attribute indicates that the element is an editable area.

The user can change the contents of the element and manipulate the markup. Web developers can define any attribute they want as long as they prefix it with data- to avoid clashes with future versions of HTML.

These are intended to be used to store custom data to be consumed by the Web page or application itself. They are not intended for data to be consumed by other parties e. The hidden attribute indicates that an element is not yet, or is no longer, relevant. The spellcheck attribute allows for hinting whether content can be checked for spelling or not.

The translate attribute gives a hint to translators whether the content should be translated. HTML also makes all event handler attributes from HTML4, which take the form on event , global attributes and adds several new event handler attributes for new events it defines; for instance, the onplay event handler attribute for the play event which is used by the API for the media elements video and audio.

The specification has an index of all events. These elements have slightly modified meanings in HTML to better reflect how they are used on the Web or to make them more useful:.

The address element is now scoped by the nearest ancestor article or body element. The b element now represents a span of text to which attention is being drawn for utilitarian purposes without conveying any extra importance and with no implication of an alternate voice or mood, such as key words in a document abstract, product names in a review, actionable words in interactive text-driven software, or an article lede.

The blockquote element still represents content that is quoted from another source but now also allows including a citation in a footer or cite element as well as inline changes such as annotations and abbreviations. The dl element now represents an association list of name-value groups, and is no longer said to be appropriate for dialogue.

The hr element now represents a paragraph-level thematic break. The i element now represents a span of text in an alternate voice or mood, or otherwise offset from the normal prose in a manner indicating a different quality of text, such as a taxonomic designation, a technical term, an idiomatic phrase from another language, a thought, or a ship name in Western texts.

For the label element the browser should no longer move focus from the label to the control unless such behavior is standard for the underlying platform user interface. The noscript element is no longer said to be rendered when the user agent doesn't support a scripting language invoked by a script element earlier in the document.

The s element now represents contents that are no longer accurate or no longer relevant. The script element can now be used for scripts or for custom data blocks. The small element now represents side comments such as small print. The strong element now represents importance rather than strong emphasis. The u element now represents a span of text with an unarticulated, though explicitly rendered, non-textual annotation, such as labeling the text as being a proper name in Chinese text a Chinese proper name mark , or labeling the text as being misspelt.

The alt attribute on img has more elaborate requirements, and in some cases can also be omitted. For details, see the specification. The accesskey global attribute now allows multiple characters to be specified, which the user agent can choose from. The action attribute on form is no longer allowed to have an empty URL.

The border attribute on table only allows the values "1" and the empty string. The colspan attribute on td and th now has to be greater than zero. The coords attribute on area no longer allows a percentage value of the radius when the element is in the circle state. The data attribute on object is no longer said to be relative to the codebase attribute.

The defer attribute on script now explicitly makes the script execute when the page has finished parsing. The dir global attribute now allows the value auto. The width and height attributes on img , iframe and object are no longer allowed to contain percentages.

They are also not allowed to be used to stretch the image to a different aspect ratio than its intrinsic aspect ratio. The href attribute on link is no longer allowed to have an empty URL. The href attribute on base is now allowed to contain a relative URL. All attributes that take URLs, e. Instead, it is said to be a pragma directive to be used by the user agent. The id global attribute is now allowed to have any value, as long as it is unique, is not the empty string, and does not contain space characters.

The lang global attribute takes the empty string in addition to a valid language identifier, just like xml:lang does in XML. The media attribute on link now accepts a media query list and defaults to "all". Verbal Ability. Interview Questions. Company Questions. Artificial Intelligence. Cloud Computing. Data Science. Angular 7. Machine Learning. Data Structures. Operating System. Computer Network. Compiler Design. Computer Organization.

Improve this question. Add a comment. Active Oldest Votes. Consistency in Handling Malformed Documents The primary one is consistent, defined error handling. Improve this answer. Xanthir Xanthir Please make some highlight to the tags and sentences by editing the answer. Its just a suggestion because while I was reading this, it made me tired. From Wikipedia : New parsing rules oriented towards flexible parsing and compatibility New elements — section, video, progress, nav, meter, time, aside, canvas New input attributes — dates and times, email, url New attributes — ping, charset, async Global attributes that can be applied for every element — id, tabindex, repeat Deprecated elements dropped — center, font, strike.

These can be used together with the new elements introduced for applications: An API for playing of video and audio which can be used with the new video and audio elements. An API that enables offline Web applications.

An API that allows a Web application to register itself for certain protocols or media types. An editing API in combination with a new global contenteditable attribute. An API that exposes the history and allows pages to add to it to prevent breaking the back button. SharpC 5, 3 3 gold badges 41 41 silver badges 37 37 bronze badges.

Viktor Viktor 2, 24 24 silver badges 29 29 bronze badges. Richard Chambers Zach Zach Mathias Bynens Mathias Bynens k 51 51 gold badges silver badges bronze badges.

David Rivers: It does exist. It has been discontinued in favor of HTML5.