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HTML DOM Interview Questions and Answers

1
What is the main function of DOM?
  • The DOM is known as Document object model and it allows the accessing of the documents like HTML and XML.
  • It allows a platform to be language neutral and provide an interface that allows the dynamic usage of the scripts and programs to access the content.
  • It also provides a way to update the content, structure and style of the document and a way to represent it in any language.
  • It is used with the language and used to create the objects that can be used as a model to allow the interface to be developed with ease.
2
What is XML family?

Display : XHTML, XSLT, XSL
Modeling : DTD, XML Schema
Manipulating : DOM, SAX
Querying : Xlink, XQL, Xpath

3
What are the functionalities performed by onload() and onUpload()?
  • onload() and onUpload() are two functions that gets activated or the event gets triggered when the user enters or leaves the page.
  • onload() event is used to verify and check the user’s visit according to the browser’s type and it loads a version of the event.
  • It provides the web page information that allows easy access to the website and consists of the information regarding the event that is triggered.
  • Onload() and onUpload() events uses the cookies to hold down the values given by the users when it enters or leaves the page.
  • This includes the example of a popup that opens up as many times the user is visiting the first page of the website.
4
Explain the syntax of UI object identifier used by DOM extension?

The DOM browser extension uses the following syntax for web UI objects:
Browser.BrowserChild(page_titile).html_class(object_tag)

  • page_title is the title of the web page, defined by the HTML TITLE tag.
  • object_tag is the label of the HTML element. How a HTML element is labeled depending on the type of HTML element.
5
What are the levels involved in DOM?
  • DOM is used to define the object with its properties that is having all the document elements and the methods allowing access to them.
  • DOM is known as document object model is divided into three different parts or levels:
  • Core DOM is used for the standard model for all the structures and the structured documents.
  • XML DOM is used as a standard model for the XML documents that can be different according to the different requirements.
  • HTML DOM is used to have a standard model used for the HTML documents having the properties and functions.
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