问题
My apologies in advance, i don't do a lot of front end development. But in short xmlns attributes are removing tags and moving them around in the rendered document. This is probably a JSF issue as it even happens in view source. This svg tag works and does not alter the structure:
<svg id="Layer_1" x="0px" y="0px" width="150px" height="150px" viewBox="0 0 150 150" enable-background="new 0 0 150 150">
But as soon as an xml namespace is declared, all the code on the page is altered. It moves my span tags, a tags, heading tags, removes closing div tags, and orders them in a way that just breaks everything. here is an example of the original xhtml, and rendered xhtml along with the html's xmlns
pre-jsf xhtml:
<a href="?service=all" class="#{servicesAllClass}">
<span>
<svg **xmlns="http://www.w3.org/2000/svg"** id="Layer_1" x="0px" y="0px"
width="150px" height="150px" viewBox="0 0 150 150" enable-background="new 0 0 150 150">
<path fill="#3A3838" d="M126.83,8.875H22.169c-7.116,0-12.884,5.768-12.884,12.884v102.482c0,7.115,5.768,12.884,16.884,12.884
H130.83c3.116,0,8.884-5.769,8.884-12.884V21.759C139.714,14.643,133.946,8.875,126.83,8.875z M38.643,118.505
c-5.93,0-10.737-4.807-10.737-10.737c0-5.93,4.807-10.736,10.737-10.736s10.736,4.807,10.736,10.736
C49.379,113.698,44.573,118.505,38.643,118.505z M38.643,83.736c-5.93,0-10.737-4.806-10.737-10.736
c0-5.93,4.807-10.737,10.737-10.737S49.379,67.07,49.379,73C49.379,78.931,44.573,83.736,38.643,83.736z M38.643,48.969
c-5.93,0-10.737-4.807-10.737-10.737s4.807-10.736,10.737-10.736s10.736,4.806,10.736,10.736S44.573,48.969,38.643,48.969z
M112.834,45.167H68.166c-4.418,0-8-3.582-8-8s3.582-8,8-8h44.668c4.418,0,8,3.582,8,8S117.252,45.167,112.834,45.167z
M112.834,80.167H68.166c-4.418,0-8-3.581-8-8c0-4.418,3.582-8,8-8h44.668c4.418,0,8,3.582,8,8
C120.834,76.586,117.252,80.167,112.834,80.167z M112.834,115.167H68.166c-4.418,0-8-3.581-8-8s3.582-8,8-8h44.668
c4.418,0,8,3.581,8,8S117.252,115.167,112.834,115.167z"></path>
</svg>
</span>
<h5>All</h5>
</a>
This is the code after JSF when xmlns is in the tag, notice the lack of a closing anchor tag, that was not left out, its just not there. When xmlns is removed however, it is displayed exactly the same as the original (above) script, so i have opted to not include it.
DOM when pulled in any browser (note the missing anchor tag, it was moved down like 30 lines)
<a href="?service=all-services" class="disabled">
<span><svg xmlns="http://www.w3.org/2000/svg" id="Layer_1" x="0px" y="0px" width="150px" height="150px" viewBox="0 0 150 150" enable-background="new 0 0 150 150">
<path fill="#3A3838" d="M126.83,8.875H22.169c-7.116,0-12.884,5.768-12.884,12.884v102.482c0,7.115,5.768,12.884,16.884,12.884 H130.83c3.116,0,8.884-5.769,8.884-12.884V21.759C139.714,14.643,133.946,8.875,126.83,8.875z M38.643,118.505 c-5.93,0-10.737-4.807-10.737-10.737c0-5.93,4.807-10.736,10.737-10.736s10.736,4.807,10.736,10.736 C49.379,113.698,44.573,118.505,38.643,118.505z M38.643,83.736c-5.93,0-10.737-4.806-10.737-10.736 c0-5.93,4.807-10.737,10.737-10.737S49.379,67.07,49.379,73C49.379,78.931,44.573,83.736,38.643,83.736z M38.643,48.969 c-5.93,0-10.737-4.807-10.737-10.737s4.807-10.736,10.737-10.736s10.736,4.806,10.736,10.736S44.573,48.969,38.643,48.969z M112.834,45.167H68.166c-4.418,0-8-3.582-8-8s3.582-8,8-8h44.668c4.418,0,8,3.582,8,8S117.252,45.167,112.834,45.167z M112.834,80.167H68.166c-4.418,0-8-3.581-8-8c0-4.418,3.582-8,8-8h44.668c4.418,0,8,3.582,8,8 C120.834,76.586,117.252,80.167,112.834,80.167z M112.834,115.167H68.166c-4.418,0-8-3.581-8-8s3.582-8,8-8h44.668 c4.418,0,8,3.581,8,8S117.252,115.167,112.834,115.167z"></path>
</svg>
<h5>All</h5>
</span>
complete document that was requested:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns:jsp="http://java.sun.com/JSP/Page" xmlns:fn="http://java.sun.com/jsp/jstl/functions" xmlns:c="http://xmlns.jcp.org/jsp/jstl/core" xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html" xmlns:ui="http://java.sun.com/jsf/facelets">
<head></head>
<body>
<ui:composition>
<div style="display:grid;">
<a href="?service=all" class=".test">
<span>
<svg xmlns="http://www.w3.org/2000/svg" id="Layer_1" x="0px" y="0px"
width="150px" height="150px" viewBox="0 0 150 150" enable-background="new 0 0 150 150">
<path fill="#3A3838" d="M126.83,8.875H22.169c-7.116,0-12.884,5.768-12.884,12.884v102.482c0,7.115,5.768,12.884,16.884,12.884
H130.83c3.116,0,8.884-5.769,8.884-12.884V21.759C139.714,14.643,133.946,8.875,126.83,8.875z M38.643,118.505
c-5.93,0-10.737-4.807-10.737-10.737c0-5.93,4.807-10.736,10.737-10.736s10.736,4.807,10.736,10.736
C49.379,113.698,44.573,118.505,38.643,118.505z M38.643,83.736c-5.93,0-10.737-4.806-10.737-10.736
c0-5.93,4.807-10.737,10.737-10.737S49.379,67.07,49.379,73C49.379,78.931,44.573,83.736,38.643,83.736z M38.643,48.969
c-5.93,0-10.737-4.807-10.737-10.737s4.807-10.736,10.737-10.736s10.736,4.806,10.736,10.736S44.573,48.969,38.643,48.969z
M112.834,45.167H68.166c-4.418,0-8-3.582-8-8s3.582-8,8-8h44.668c4.418,0,8,3.582,8,8S117.252,45.167,112.834,45.167z
M112.834,80.167H68.166c-4.418,0-8-3.581-8-8c0-4.418,3.582-8,8-8h44.668c4.418,0,8,3.582,8,8
C120.834,76.586,117.252,80.167,112.834,80.167z M112.834,115.167H68.166c-4.418,0-8-3.581-8-8s3.582-8,8-8h44.668
c4.418,0,8,3.581,8,8S117.252,115.167,112.834,115.167z"></path>
</svg>
</span>
<h5>All</h5>
</a>
</div>
</ui:composition>
</body>
</html>
Details:
My clear question: "What could possibly cause the dom to be changed when an XML namespace attribute is added to an element?"
application server + IDE: Glassfish 5.0 - Java EE 8 - JSF 2.3.2 - SCSS css pre-proccessor only processing .scss files - intellij IDEA Ultimate (Latest)
all files are .xhtml, there are currently no managed beans, code, or javascript that in any way effect this.
When html is put in tomcat without JSF this does not happen. This is why i am pointing at JSF but i may be incorrect.
回答1:
I debugged a bit and found this must be happening in JSF SAXCompiler routines.
While the com.sun.faces.facelets.compiler.SAXCompiler.CompilationHandler gets its' startElement and endElement methods invoked in correct order as per the XHTML source code, the result of
FaceletHandler h = this.compiler.compile(url, alias);
at line 475 of com.sun.faces.facelets.impl.DefaultFaceletFactory Mojarra 2.3.8, is a FaceletHandler representing the observed wrong element tree structure.
This has been reported as bug #4555.
There has also been a very similar question before which was then reported as a bug to Mojarra. As that bug is resolved, I'd consider this to be a new one. So I'd suggest you to report that bug using a minified reproducable example. For your application you should consider to emebed SVGs using <ui:include src="/resources/svg/one.svg" /> as BalusC suggest in response to the other question.
来源：https://stackoverflow.com/questions/55052032/why-would-an-inline-xmlns-change-the-entire-tag-structure-jsf