<a href="javascript:(function(){var%20newSS,%20styles='*%20{%20background:%20black%20!%20important;%20color:%20#fff%20!important%20}%20:link,%20:link%20*%20{%20color:%20#9ef%20!important%20}%20:visited,%20:visited%20*%20{%20color:%20#e9f%20!important%20}';%20if(document.createStyleSheet)%20{%20document.createStyleSheet(&quot;javascript:'&quot;+styles+&quot;'&quot;);%20}%20else%20{%20newSS=document.createElement('link');%20newSS.rel='stylesheet';%20newSS.href='data:text/css,'+escape(styles);%20document.getElementsByTagName(&quot;head&quot;)[0].appendChild(newSS);%20}%20})();">White Font On Black Background</a>

=== The original "Darken" bookmarklet revised by me. I prefer that the text be white, instead of grey as in the original "darken" bookmarklet, so I changed the "color" (which primarily refers to the font color) from "grey" to #fff While you are viewing any webpage, at almost any site, you can click one of your favorite bookmarks, and the page you are viewing will adjust to White text on a Black background. (not GMail, though, for example, which will not switch). Then, to go back to the page's original default display, click the "Refresh" button at the top of your browser window, or the "F5" on your key-board. === Create your bookmarklet, in a text editor. - Copy the immediately following code into a text editor, and Not a Word Processor. ### (Do Not include This Line) javascript:(function(){var%20newSS,%20styles='*%20{%20background:%20black%20!%20important;%20color:%20#fff%20!important%20}%20:link,%20:link%20*%20{%20color:%20#9ef%20!important%20}%20:visited,%20:visited%20*%20{%20color:%20#e9f%20!important%20}';%20if(document.createStyleSheet)%20{%20document.createStyleSheet("javascript:'"+styles+"'");%20}%20else%20{%20newSS=document.createElement('link');%20newSS.rel='stylesheet';%20newSS.href='data:text/css,'+escape(styles);%20document.getElementsByTagName("head")[0].appendChild(newSS);%20}%20})(); ### (Do Not include This Line) 1 - Create a single line of code by deleting any line-breaks and the spaces associated with those line-breaks above. (if necessary) 2 - Delete the space from between the first of two occurrences of the word pair "java script" so that it is a single word. (This forum does not allow the word "javascript" to display without a space in it, so delete the middle space to create a single ten-character word.) It is not necessary to delete the space in the second occurrence of the expression "java script"; although the code will work if you do delete the space in the second occurrence. 3 - Then simple replace any one of your existing bookmark's Properties' "Location" with the code you have prepared in your text editor. === The following CODE is the full HTML code which can be placed on any web page; to allow that page to be changed to "white on black" with a single click. The java code below differs from the code above in that the double-quotation marks (") which work in a bookmark will not work in HTML code. The double-quotation marks you see in the code above need to be converted to the six character expression (without the spaces between).. & q u o t ; which is the HTML equivalent of a double-quotation mark. There are eight occurrences of double-quotation marks below. Leave the first and last occurences of the double-quotation marks alone, and change the middle six occurences to (without the spaces).. & q u o t ; You must also delete the space in the middle of the first of the two occurrences of "java script", creating a single ten-character expression; although eliminating the space in the second occurrence is optional. <a href="javascript:(function(){var%20newSS,%20styles='*%20{%20background:%20black%20!%20important;%20color:%20#fff%20!important%20}%20:link,%20:link%20*%20{%20color:%20#9ef%20!important%20}%20:visited,%20:visited%20*%20{%20color:%20#e9f%20!important%20}';%20if(document.createStyleSheet)%20{%20document.createStyleSheet(&quot;javascript:'&quot;+styles+&quot;'&quot;);%20}%20else%20{%20newSS=document.createElement('link');%20newSS.rel='stylesheet';%.createStyleSheet)%20{%20document.createStyleSheet(&quot;javascript:'&quot;+styles+&quot;'&quot;);%20}%20else%20{%20newSS=document.createElement('link');%20newSS.rel='stylesheet';%20newSS.href='data:text/css,'+escape(styles);%20document.getElementsByTagName(&quot;head&quot;)[0].appendChild(newSS);%20}%20})();">Switch This Page To White Font On Black Background.</a> === To adjust the "link"s and the "visited" links' colors.. I use the 16-character hexadecimal (also base-16, hexa, or hex) numbering system instead of "names" when specifying colors; and I used hex instead of any other possible color determining system. The 16 possible characters are 0 to f (or F; but I use lower-case, always) 0123456789abcdef ("#" "r" "g" "b") - This is the rgb (red-green-blue) light intensity settings designation I use in all my HTML coding, and which I used in the java coding. ..for black I use #000 which is to say that the three light guns, red, green, and blue are set to zero. (or double precision works too; #000000) and for white as #fff because all three light variables, red, green, and blue, are fully on. (or #ffffff) and red only (a third of total light) is #f00 (or #ff0000) etc. === To get the unvisited "link"s, and "visited" links to brighten up to 5/6 of the intensity of white light... The "link" color originally was.. #0000EE which is the same as #00e which is 15/16 of the total blue light possible, and which is less than 1/3 the possible total light; and so I added grean and red in combination so that unvisited "link"s are now #9ef The "visited" color originally was.. #551A8B which is roughly #529 and I now have it at #e9f You could change the background color from the name "black" to #000 and it would be the same as it is; although you can make the background whatever-- 0 to f for each of red, green, and blue. (or capital A-F, although I always use lower case).