Html Book

The World Wide Web is composed primarily of HTML documents transmitted from web servers to web browsers using the Hypertext Transfer Protocol (HTTP). However, HTTP is used to serve images, sound, and other content, in addition to HTML. To allow the web browser to know how to handle each document it receives, other information is transmitted along with the document. This meta data usually includes the MIME type (e.g., text/html or application/xhtml+xml) and the character encoding (see Character encoding in HTML).

The most common filename extension for files containing HTML is .html. A common abbreviation of this is .htm, which originated because some early operating systems and file systems, such as DOS and the limitations imposed by FAT data structure, limited file extensions to three letters.[92]

Html Book

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One difference in the latest[when?] HTML specifications lies in the distinction between the SGML-based specification and the XML-based specification. The XML-based specification is usually called XHTML to distinguish it clearly from the more traditional definition. However, the root element name continues to be "html" even in the XHTML-specified HTML. The W3C intended XHTML 1.0 to be identical to HTML 4.01 except where limitations of XML over the more complex SGML require workarounds. Because XHTML and HTML are closely related, they are sometimes documented in parallel. In such circumstances, some authors conflate the two names as (X)HTML or X(HTML).

By carefully following the W3C's compatibility guidelines, a user agent should be able to interpret the document equally as HTML or XHTML. For documents that are XHTML 1.0 and have been made compatible in this way, the W3C permits them to be served either as HTML (with a text/html MIME type), or as XHTML (with an application/xhtml+xml or application/xml MIME type). When delivered as XHTML, browsers should use an XML parser, which adheres strictly to the XML specifications for parsing the document's contents.

That wraps up the basics of individual HTML elements, but they aren't handy on their own. Now we'll look at how individual elements are combined to form an entire HTML page. Let's revisit the code we put into our index.html example (which we first met in the Dealing with files article):

READ: MIRI Status: 5 | 4 | 3 | 2 | 1 ", "thumbnailUrl":"/content/webbLaunch/assets/images/mirrorAlignment/segmentIdPhaseIcon7aFinalCoolDown.png", "stateImageUrl":"/content/webbLaunch/assets/images/mirrorAlignment/miriFinalCooldown-1200px.png", "stateImageWrapCssOverride": "background:none; max-width:1200px; ","stateImageCssOverride": "filter: initial !important; ", "moreDetails": " ","relatedImages": [{ "name": "imageName1","url": "/ImagesContent/ariane5Launch-9-29-2017-VA239_2.jpg","description": "This is the description. Could be minimal html",},], "relatedVideos": [{ "name": "ALL ABOUT Webb Telescope","url": " -xrk8","description": "Webb Quick Start: the basics you need to know about Webb",},],"relatedLinks": [{"name": "Webb's Launch","url": "/content/about/launch.html","description": "All about Webb's Launch.","target":"",},],"approxStartTimeRelToLaunch": "dd:hh:mm","approxEndTimeRelToLaunch": "dd:hh:mm","approxDistanceFromEarthMiles": 0,"approxDuration": 0,"approxSpeedMph": 0 },{ "eventId": "154","title":"Iterate Alignment for Final Correction", "subtitle": "Step 7- COMPLETE!", "nominalEventTime": "Starts - Launch + ~4 Months", "status" : " Complete ","details": "After applying the Field of View correction (step 6), the key thing left to address is the removal of any small, residual positioning errors in the primary mirror segments. We measure and make corrections using the Fine Phasing process (step 5). We will do a final check of the image quality across each of the science instruments; once this is verified, the wavefront sensing and controls process will be complete. ff782bc1db