1.0CSS learning masteryhttps://gigz.pk/cssAyeshahttps://gigz.pk/css/author/ayesha/rich600338<blockquote class="wp-embedded-content" data-secret="u6gQmBOvbU"><a href="https://gigz.pk/css/lesson/introduction-to-bootstrap/">Introduction to Bootstrap</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://gigz.pk/css/lesson/introduction-to-bootstrap/embed/#?secret=u6gQmBOvbU" width="600" height="338" title="“Introduction to Bootstrap” — CSS learning mastery" data-secret="u6gQmBOvbU" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript"> /* <![CDATA[ */ /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://gigz.pk/css/wp-includes/js/wp-embed.min.js /* ]]> */ </script> Bootstrap is a popular front end framework used to design modern, responsive websites quickly and efficiently. It provides a collection of ready made components, styles, and layout tools that help developers create professional looking web pages without writing extensive CSS from scratch. Bootstrap was originally developed by Twitter and is now maintained by a global […]