<html>
<head>
<title> Description Lists</title> 
<style type= "text/css">
body{background-repeat:no-repeat;background-image:url("Blood Test.jpeg")
dt{text-transform:uppercase;color:red;text-shadow:20px 20px purple;text-align:centre;font-size:30px}
dd{font-style:cursive;font-family:cursive;font-size:20px}
</style>
</head>
<body>
<dl>
<dt>DNA</dt>
<dd>Deoxyribonucleic acid (/diːˈɒksɪˌraɪboʊnjuːˌkliːɪk, -ˌkleɪ-/ (About this soundlisten);
[1] DNA) is a molecule composed of two polynucleotide chains that coil around each other to form a double helix carrying genetic instructions for the development, functioning, growth and reproduction of all known organisms and many viruses. DNA and ribonucleic acid (RNA) are nucleic acids. 
Alongside proteins, lipids and complex carbohydrates (polysaccharides), 
nucleic acids are one of the four major types of macromolecules that are essential for 
all known forms of life.</dd>
<dt>RNA</dt>
<dd>Ribonucleic acid (RNA) is a molecule similar to DNA. Unlike DNA,RNA is single-stranded. 
An RNA strand has a backbone made of alternating sugar (ribose) and phosphate groups. 
Attached to each sugar is one of four bases--adenine (A), uracil (U), cytosine (C), 
or guanine (G). Different types of RNA exist in the cell: messenger RNA (mRNA), ribosomal RNA (rRNA), and transfer RNA (tRNA). More recently, 
some small RNAs have been found to be involved in regulating gene expression.</dd>
</dl>

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About HTML

HTML(Hyper Text Markup language) is the standard markup language for Web pages, was created by Berners-Lee in the year 1991. Almost every web page over internet might be using HTML.

Syntax help

Fundamentals

  • Any HTML document must start with document declaration <!DOCTYPE html>
  • HTML documents begin with <html> and ends with </html>
  • Headings are defined with <h1> to <h6> where <h1> is the highest important heading and <h6> is the least important sub-heading.
  • Paragrahs are defined in <p>..</p> tag.
  • Links are defined in <a> tag.

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  • Images are defined in <img> tag, where src attribute consists of image name.
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  • Lists are defined in <ul> for unordered/bullet list and <ol> for ordered/number list, and the list items are defined in <li>.

HTML Elements and Attributes

  • HTML element is everything present from start tag to end tag.
  • The text present between start and end tag is called HTML element content.
  • Anything can be a tagname but it's preferred to put the meaningful title to the content present as tag name.
  • Do not forget the end tag.
  • Elements with no content are called empty elements.
  • Elements can have attributes which provides additional information about the element.
  • In the below example, href is an attribute and a is the tag name.

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CSS

CSS(cascading style sheets) describes how HTML elements will look on the web page like color, font-style, font-size, background color etc.

Example:

Below is a sample style sheet which displays heading in green and in Candara font with padding space of 25px.

body{
  padding: 25px;
}
.title {
	color: #228B22;
	font-family: Candara;
}

HTML Tables

  • HTML Tables are defined in <table> tag.
  • Table row should be defined in <tr> tag
  • Table header should be defined in <th> tag
  • Table data should be defined in <td> tag
  • Table caption should be defined in <caption> tag

HTML-Javascript

  • Javascript is used in HTML pages to make them more interactive.
  • <script> is the tag used to write scripts in HTML
  • You can either reference a external script or write script code in this tag.

Example

<script src="script.js"></script>