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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
CSS Style Diagrams - working out where attributes come from

I have just been helping a customer who's got a problem with white text on a white background ... and hasn't been able to easily identify where the problem lies. Some of his code looks like this:

<div id="Layer6">
<div align="center" class="style11 style13">
<div align="left" class="style17">
<span class="style12">[Phone no]</span>
</div>
</div>
</div>


And I found myself struggling as well! The solution is to draw up a diagram showing the nesting and where each of the relevant attributes is sourced from ... filling in a table that looks something like this:

That will then give him (or me or you) a firm foundation on which to edit the source and experiment to confirm the analysis, which it turn will lead on towards a solution. I suspect the problem will become quickly apparent!

I made one further little suggestion - is there any way he could rename some of his styles? Using words like "style17" doesn't make them very self-descriptive, and so it is very easy for logic errors to slip in. In fact, I suspect that the customer's problem relates to the style called "style11 style13" which may be a typo. We tend to use words like "bodytext" and "headline" for our styles, and it makes the analysis much easier.



Comment - Caitlinn says ...

... "style11 style13" means that they are applying both style11 AND style13 to the div and it is correct syntax for combining classes.

That is one serious case of div-itis. Any way they could use HTML elements rather than so many divs? That too would help them to better understand their layout and probably cut down on the use of some many styles.
(written 2009-06-08, updated 2009-06-09)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
W704 - Web and Intranet - Cascading style sheets - putting it all together
  [501] .css - using PHP to make dynamic style sheets - (2005-11-21)
  [565] Using PHP to output images, XML, Style sheets, etc - (2006-01-15)
  [994] Training on Cascading Style Sheets - (2006-12-17)
  [996] Setting your colour theme through PHP - (2006-12-17)
  [1677] CSS training - Cascading Style Sheets (UK course) - (2008-06-15)
  [4037] Cascading Style Sheets and formatting your web page - (2013-03-10)

W509 - Web and Intranet - Style
  [1019] span and div tags - a css comparison - (2007-01-02)
  [1034] The new web site look spreads - (2007-01-15)
  [1519] Flipping images on your web page - (2008-01-26)


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