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System Software | Device Drivers | Part - 2

Device Driver is a software & this is a type of system software. Driver are need for all the hardware installed in the computer because these drivers help to connect the hardware to the operating system, Without drivers the operating system will not give any commands. "The Driver acts like a bridge between the O/S & Hardware" Which Devices need Drivers : All hardware devices that are unknown to the operating system or Components that the operating system does not understand, drivers are need for them. Some device drivers come with hardware which is available in the CD & Some hardware requires drivers to be downloaded from the internet.  List of hardware device that require drivers : Card Reader Modem Motherboard Chipset Printer Web Cam Wi-fi Adapter Scanner Controller USB Devices Video Card Sound Card Which Devices not need Drivers : Nowadays, many drivers come in the operating system, due to which some hardware does not require drivers tha...
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Html Head tag | Script Tag & Link Tag | Part - 2

The last part of Html Head Tag we discuss about the head tag and use of style tag and title tag, these tags are used in the Head Tag. In This part of we discuss about the Script Tag and Link Tag. let's starts!


Script Tag | The Script Element |

JavaScript is a programming language and a JavaScript code insert between the script tag. JavaScript is used to perform function in website.


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Script tag placed inside the head section and body section of HTML web page. We can insert many numbers of script element in the head & body.

In the html page script tag identifies a block of script code, Java script function can be executed when "called". As the user clicks the button and the function of the button performs its function.

We can include the JavaScript directly in the script tag or we can also add JavaScript via URL in the script tag. JavaScript files saved with the .js file extension.

JavaScript in Head :


                                               



The Html Script tag support additional attributes :

  • async - value "async"
Specifies that the script is executed asynchronously and only for external scripts if the "src" attributes is present.

  • defer - value "defer"
Specifies that the script is executed when the page has finished parsing and use only for the external script.
  • scr - value "URL"

Specifies the URL of external script.

  • type - value "scrip type/text/JavaScript application"

specifies the media type of the link document.

Link Tag | The External Resource Link Element |

The Link tag is used for external document and it is insert between head tag. Link tag create the relation between the document and external resource 

The Link element is a empty element it does not have closing tag and it contains only attribute.

Link tag are often used to link the external style sheet file to the web page.

Link Tag Syntax :



Here Link tag attribute is rel and href :
  • rel - value
"appendix/bookmark/chapter/contents/copyright/glossary/help/home/index/next/prev/section/start/stylesheet/subsection"

It describe the relationship between current document and link document.
  • href - value "URL"
It specified the location/ URL of the linked/resource document. 



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