(compare support of CSS) These development tools are useful for on-the-fly analysis of CSS sheets and tinkering with them; can show the 'Cascade' and over-rides; can also show a box model of your page
The HREF link. An element, usually an A(nchor), with an HREF attribute can trigger quite a range of events:
can load contents of another page into the current window. The 'classic' hypertext link, often described as 'jumping' or 'going to' the other page/site. or,,
it, with the attribute
target=_blank could make the browser open another window and load the other page into it. In the worst of the bad old days, the new window opened just on top of the first window, partially or almost fully covering it.
However, note well that the
About a decade ago, Firefox added 'tabbing', which allowed links with
target=_blank to trigger loading of the new page into a 'tab' indicated at the top of the browser window, and gave the option to open the tab in the viewing window (e. g., change the browser's focus to the tabbed window). Today, link-opening is controlled mostly by the right mouse button, which gives the options of opening in a new tab or a new window. Regardless of the setting in Preferences or Options or what have you, right clicking on a link will give you the option of opening the link in a new tab or a new window, and Firefox allows you to set focus preference when you do open in a tab. Finally, Chrome allows you to drag a tab off as a separate window (or tuck a separate window into the tab bar as a tab.) BTW: you can drag a link from a page displayed in Chrome to the Firefox tab line and it will open as a tab in Firefox.
it can load a section earlier or later on in the same document. In this case, it targets an element with a specific id assigned to it and scrolls the document so that the target identified element is at the top of the window, or is at least visible. By convention, these links do not open different tabs or windows, since they are parts of the document being viewed.
☛ The Back operation does not work in new windows or tabs, because it references a 'history' object for the window and tab and these, being new, have no history before this very instance of their creation.