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Editorial Team
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Asked: 2026-05-31T11:31:48+00:00

Let’s say we have the following html syntax: <TABLE width=400, height=300> <TR> <TD color=Red>SOME

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Let’s say we have the following html syntax:

<TABLE width=400, height=300>
<TR>
  <TD color=Red>SOME TEXT</TD>
</TR>
</TABLE>

as it can be seen, there is no style used, all tags are written using the uppercase letters. This is invalid. I would like to inform it this kind of incorrect HTML syntax has an influence in web performance?

Additionally, in the code I get from the client, lots of HTML controls are build in code-behind and then injected in the aspx.
How is with performance in such a case?

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1 Answer

  1. Editorial Team

    Uppercase elements are valid in HTML. HTML is case insensitive. While XHTML is not – everything should be lower case.

    Upper vs lower case should not affect performance. But lots of CSS inline with the HTML might very well affect performance as often an external CSS will more effectively define the style globally instead of each element.

    HTML

    http://www.w3.org/TR/html4/about.html#h-1.2.1

    Element names are written in uppercase letters (e.g., BODY). Attribute names are written in lowercase letters (e.g., lang, onsubmit). Recall that in HTML, element and attribute names are case-insensitive; the convention is meant to encourage readability.

    XHTML

    http://www.w3.org/TR/xhtml1/#h-4.2

    XHTML documents must use lower case for all HTML element and attribute names. This difference is necessary because XML is case-sensitive e.g. <li> and <LI> are different tags.

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