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| I'm sure I've seen this discussed elsewhere, but [[wikipedia:HTML|HTML]] is messed-up.
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| It is (now) ostensibly a data-description language which has been corrupted for use as a visual markup language, and it does not serve the needs of either very well. Current planning seems to be heading toward replacing HTML with [[wikipedia:XHTML|XHTML]], which may finally strip the last of the visual markup elements from HTML and push them out into [[wikipedia:CSS|CSS]] (style sheets) where they belong, but the resulting pair of languages is still an awkward tool for creating user interfaces. (I will discuss this more at length.)
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| HTML is also internally inconsistent:
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| *Using <img src=''URL''> syntax, a page may contain images which are defined elsewhere, but a page may not include text defined elsewhere (except via action on the server's part, e.g. [[wikipedia:Server Side Includes|SSI]]). All text within a page is defined within a single file, but there is no way to define images within the same file; this considerably complicates web application programming in some ways.
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| *Images and tables have some basic characteristics in common, i.e. they are both basically rectangular; HTML's handling of them is also similar in many ways, i.e. either can be aligned flush left or right, so that the rest of the page's contents can wrap around them. Only images, however, can be handled like words in a paragraph, i.e. allowed to wrap when the end of a line is reached. There is no reason why tables should not also have this ability. The lack of this ability prevents linewrapped image sets from having captions, as the only way to give an image a caption is to enclose it within a table.
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| *"Box" elements in HTML (such as tables, images, etc.) may have their sizes defined as a percentage of the available room. However, this is often handled very poorly -- if the available room is partly blocked by a left- or right- aligned table or image, the blockage is often ignored in calculating the block element's size, which can easily result in elements becoming unintentionally (and uncontrollably) superimposed on top of each other, giving incomprehensible or at least very ugly results.
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| *The "page" is treated as either being the size of the browser window (e.g. in "height=''x''%" tags), the size of the printable area of a page if the document is printed (or print-previewed), or as an infinitely extendible scroll, depending on context. There is no way for the HTML author to specify which meaning is intended. ''(I know I need to put in an example of this, but can't think of one just now.)''
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| *Although you can specify that an image (or other element) should take up 100% of the width of the page ''or'' 100% of the height of the page, there is no way to specify that it should take up 100% of whichever dimension is ''smaller'' (i.e. "fit to page"). This makes it impossible to automatically generate html pages where all images in a series are correctly fitted to print without either being cut off at the sides or spilling over to the next page; the output must be checked by eye and the image tag corrected to be height=100% or width=100% as appropriate.
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| This article isn't necessarily finished; it's just written to the point where I ran out of time. I'm planning to discuss what I'd like to see replacing HTML in this article: [[IOML|I/O Markup Language]]
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