Web Page 1: Harmful Effects of Plastic on Environment

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 <h1>Harmful Effects of Plastic on Environment</h1>

 <p>Plastic is a non-biodegradable material that is harmful to the environment. It takes hundreds of years for plastic to decompose, and during this time, it releases harmful chemicals into the soil and water. Here are some of the harmful effects of plastic on the environment:</p>

 <ul>
  <li>Plastic pollution in oceans and waterways can harm marine life and disrupt ecosystems.</li>
  <li>Plastic waste in landfills can release toxic chemicals into the soil and groundwater.</li>
  <li>Plastic production contributes to greenhouse gas emissions, which contribute to climate change.</li>
  <li>Plastic waste can also be a fire hazard, releasing toxic fumes into the air when burned.</li>
 </ul>

 <p>It is important to reduce our use of plastic and find alternative materials that are more environmentally friendly.</p>

 <a href="pollution.html">Next: Pollution All Around Us</a>

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Web Page 2: Pollution All Around Us

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 <h1>Pollution All Around Us</h1>

 <p>Pollution is a major problem that affects our environment and our health. Here are some of the types of pollution that we encounter:</p>

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  <li>Air pollution from vehicle exhaust, factories, and other sources can cause respiratory problems and contribute to climate change.</li>
  <li>Water pollution from industrial waste, agricultural runoff, and other sources can harm marine life and make water unsafe for human use.</li>
  <li>Noise pollution from traffic, construction, and other sources can cause hearing loss and other health problems.</li>
  <li>Light pollution from streetlights and other sources can disrupt ecosystems and interfere with sleep patterns.</li>
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 <p>We can all take steps to reduce pollution by using public transportation, conserving water, reducing energy use, and properly disposing of waste.</p>

 <a href="plastic.html">Previous: Harmful Effects of Plastic on Environment</a>

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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.

    Example:

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  • Images are defined in <img> tag, where src attribute consists of image name.
  • Buttons are defined in <button>..</button> tag
  • 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.

    Example:

    <a href="https://onecompiler.com/html">HTML online compiler</a>

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>