Explanation: .html or .htm extensions are used to save the HTML file.

Explanation: HTML is the standard markup language mainly used to create web pages. HTML describes the structure and layout of a webpage. HTML consists of a series of elements that helps the browser how to display content easily.

Explanation: HTML stands for “HyperText Markup Language”. HTML is the standard markup language mainly used to design and create web pages and web applications.

Explanation: In HTML, <br> tag is used to create a blank line. <b> tag is used to specify the bold text. <em> tag is used to define the emphasized text.

Explanation: A web browser (commonly referred to as a browser) is a software application for retrieving, presenting and traversing information resources on the World Wide Web. A web server process, store and display output to the client as per their request. Web matrix is a discontinued cloud-connected website builder and HTML editor for Windows.

Explanation: HTML is case insensitive while XHTML is case sensitive. In XHTML, special characters can be escaped using character entites but not in HTML. Charset in HTML is “text/html” where as it is “application/xml+xhtml” for XHTML.

Explanation: Headings in HTML starts from <h1> to <h6> in which <h1> heading is the largest one and <h6> is smallest one among those. The heading tags are <h1> <h2> <h3> <h4> <h5> and <h6> that are used for the creations of headings.

Explanation: The Document Object Model is a cross-platform and language-independent application programming interface that treats an HTML, XHTML, or XML document as a tree structure. A document can be viewed as a logical tree with help of DOM Model.

Explanation: Metadata is information about data. The meta tag provides metadata/meta information about the HTML document. Metadata will not be displayed on the page. Metadata is present in head. The body tag defines document’s body. A title tag is an HTML element which specifies the title of a web page.

Explanation: <video> tag is used to display video clips in HTML5. Multiple media resources for media elements is specified by <source> tag. Text track for media elements i.e. <audio> & <video> is provided by <track> tag in HTML5. There is no such thing as slider tag in HTML5.

Explanation: Browser ignores comment in a code. There are always two types of command i.e. single line command and multiple line command. If one wants to add a comment in code, add the text between these characters <!…..comment….>. It will not visible in the user’s browser.

Explanation: The media to which linked document is optimized is given by <media> tag. Before HTML5, videos could only be played with a plug-in (like flash). The HTML5 video element specifies a standard way to embed a video in a webpage. As like <video> elements, <audio> element contains additional files or streams like music, recording, etc.

Explanation: There are three elements in HTML table layout i.e. size, spanning and alignment. Layout type can be achieved by setting Rows elements layout attribute to Fixed or Auto. Auto attribute relies on browser compatibility whereas fixed layout relies on developer specification.

Explanation: For styling HTML5, CSS i.e Cascading Style Sheet is used. It is style sheet language and designed to describe presentation of its content including layouts, colors and fonts. CSS can control the layout of multiple webpages.

Explanation: By enclosing words in the tags <b>and</b> we can make characters appear bold. <i> element is for content in italics, <u> is for underlined content, <br> is for vertical breaking.

–> Alt attribute is used to specify the alternate text for the image.

Explanation: HTML is a subset of SGML. SGML (Standard Generalized Markup Language) is a standard for specifying a document markup language or tag set.